I feel the same concerns for which US bans tiktok are valid for EU and fb/meta/x/twitter/google. How do we know they're not siphoning our EU data to the US, or

I feel the same concerns for which US bans tiktok are valid for EU and fb/meta/x/twitter/google. How do we know they're not siphoning our EU data to the US, or controlling what the algorithm shows us to influence politics?