"You don't need to remind you the essence of competition is
    always been quite simple, any kid working in a garage
    anywhere in the world with a good idea can put us out
    of business".

Harassing independent developers working is an important component of the Antitrust plot. And that's what the replit guy is doing.

    Milo: It would be open source, we offer it free to
    everybody, just charge for tech support.

    Gary: Wow, free.
    It's a cut-throat business we're in Milo.
    It's just a matter of time before someone borrows your
    technology, improves it and makes a billion dollars on it.
    What would you do with a billion dollars Milo?
    ...
    The question really is,
    How many of the people you share discoveries with
    will be altruistic? and how many will make fortunes
    of your generosity?

The movie shows the conflict between open source and proprietary software. Between altruism and financial opportunity.