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I probably wrote it in a confusing way, but my main point is that you shouldn't expect a game to become super popular when you're making it. Investors look at Dota's stats, say "Wow, that's great, even the non-peak online is 500k, we need to jump into the MOBA genre! Let's go, faster, I'll give you money, and you'll rake it in!" – but with a 99% probability, at best, they'll end up with Smite... Which, by the way, is also one of the most popular representatives of the genre, it appears in the news, yes, but it no longer reaches the level of a mediocre strategy game (let alone a top-tier one like Civilization).
Most major publishers don't want to work hard and earn little; it's better to make one project that will be a hit and will be milked for many years, and you will lazily add and sell new skins for it.
it still seems that the problem is greed.