Isn't this capitalism? A few decades ago the game industry feared illegal copies would destroy it. We got all kind of crappy copyright protections.

Usually when something is great, people want to use it, distribute it, and improve it. If everything is closed sources and guarded for profit, arts and music would be very different. Everyone is "inspired" by others, even if they all think it's their own idea. Even languages copy on each other.

If the goal is only to make a game for profit, keep it exclusive, I can't say I have a lot of sympathy.

EDIT: In the 80ies there were clones of popular games too, and the industry complained about copies, and survived. https://1900hotdog.com/2020/06/nerding-day-donkey-kong-ripoffs/