The anti-cheats are there to detect the cheats, not necessarily stop them (though they usually do that too, at least the basic ones). When they’re detected, they can ban accounts or whatever. They usually do this in waves to prevent cheat developers from knowing exactly when their cheats were detected and what triggered the anti-cheat.
Brave itself is not a Google product, but does heavily rely on an engine controlled by Google, which is unfortunate. This is a distinct difference though, there are things Google cannot force brave to do like chrome’s new found ability to send ads based on browsing history, and there are things brave can do that Google doesn’t want them to, like integrated advanced ad blocking.
Still though, Google controlling the browsing view experience for so many browsers is not great and I’m sure it won’t be long before they figure out how to do something we wouldn’t want them to that brave won’t be able to stop because of their reliance on chromium.
iCloud is a data backup system, it has nothing to do with the topic at hand