I'm no specialist on this. Also searching for an easy solution for our users.
Did you see this: "Code Syntax Highlighting in Atto" https://moodle.org/mod/forum/discuss.php?d=339420 ?
Visvanath Ratnaweera
Posts made by Visvanath Ratnaweera
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One more video:
Using Moodle for MOOCs | Gavin Henrick at MoodleMoot Ireland & UK 2016
One more video:
Using Moodle for MOOCs | Gavin Henrick at MoodleMoot Ireland & UK 2016
So far so good. But keep in mind: This is a Moodle teen since 9 days guiding an adolescent in his (first?) love. The outcome is anybody's guess.

On a serious note: The general question, " is LMS X is better than Moodle" has been answered by Colin. (My +10 to it.) Your question now is, "I am going to give a MOOC. Is Moodle a good choice?"
I don't know. My only exposure to MOOCs is as a _participant_ in only a few of them. I think the only one which was running Moodle was the first Moodle MOOC "Teaching with Moodle: An Introduction". The follow-up is here: https://moodle.org/mod/forum/discuss.php?d=240593. But that was 2013. Things must have changed. Here is a report from Fall 2017: (found though a web-search, haven't watched it).
About the numbers: You can register 2 million users in any 10 year old machine. The question is how active they will be. There is a specialized forum for such matters: https://moodle.org/mod/forum/view.php?id=596. At least equally important is the lesson plan of the course, and the teaching resources. How exactly, you the teacher and the tools provided by the LMS, are going to teach for example 10,000 students. The former, hardware scaling, I would love to tackle, if it is Moodle. (See my profile. ;) The latter, the teaching part, sorry, never done and not too keen on doing.
On a serious note: The general question, " is LMS X is better than Moodle" has been answered by Colin. (My +10 to it.) Your question now is, "I am going to give a MOOC. Is Moodle a good choice?"
I don't know. My only exposure to MOOCs is as a _participant_ in only a few of them. I think the only one which was running Moodle was the first Moodle MOOC "Teaching with Moodle: An Introduction". The follow-up is here: https://moodle.org/mod/forum/discuss.php?d=240593. But that was 2013. Things must have changed. Here is a report from Fall 2017: (found though a web-search, haven't watched it).
About the numbers: You can register 2 million users in any 10 year old machine. The question is how active they will be. There is a specialized forum for such matters: https://moodle.org/mod/forum/view.php?id=596. At least equally important is the lesson plan of the course, and the teaching resources. How exactly, you the teacher and the tools provided by the LMS, are going to teach for example 10,000 students. The former, hardware scaling, I would love to tackle, if it is Moodle. (See my profile. ;) The latter, the teaching part, sorry, never done and not too keen on doing.
Hi Twahir
You asked:
> What would you say is the main difference between Moodle and Open EdX?
That in the Moodle community? Never thought you might get biased answers at best, or even post-truths https://en.wikipedia.org/wiki/Post-truth_politics ?
;-D
> Hype out there seem to feel that Open EdX can serve a greater number of students concurrently as opposed to Moodle [sad]
Why sad? Physics says, that greater number of students get less per head. As an example, compare two teachers, who are stretched to serve 10,000 students to a simple teacher in front of only a dozen.
Seriously, you are comparing apple to pears. (I assume) Open EdX is made for mass courses. Moodle for the caring teacher - at least at the beginning.
> With exposure in Moodle now, am kinda falling in love with it. Your thoughts?
You took 11 years to fall in love: https://moodle.org/user/profile.php?id=134336. I would say, there's a pretty good chance that it'll last.
You asked:
> What would you say is the main difference between Moodle and Open EdX?
That in the Moodle community? Never thought you might get biased answers at best, or even post-truths https://en.wikipedia.org/wiki/Post-truth_politics ?
;-D
> Hype out there seem to feel that Open EdX can serve a greater number of students concurrently as opposed to Moodle [sad]
Why sad? Physics says, that greater number of students get less per head. As an example, compare two teachers, who are stretched to serve 10,000 students to a simple teacher in front of only a dozen.
Seriously, you are comparing apple to pears. (I assume) Open EdX is made for mass courses. Moodle for the caring teacher - at least at the beginning.
> With exposure in Moodle now, am kinda falling in love with it. Your thoughts?
You took 11 years to fall in love: https://moodle.org/user/profile.php?id=134336. I would say, there's a pretty good chance that it'll last.
Any connection to "Is it possible to postpone the MySQL utf8mb4 requirement?" https://moodle.org/mod/forum/discuss.php?d=363207 ?