The only surefire form of privacy is to not store information digitally in the first place, ideally not at all.

But sometimes we do have information that needs storing. And in that case privacy requires that you control the data at rest and encrypt the data at transit. All free cloud services can snoop your data if they really want to. If you value privacy, minimize your use of them.

You should assume that every social network is ride with spying, both for corporate and governmental purposes. For example, the main reason TikTok is currently getting threatened with a banning is because they have a less fed-friendly algorithm, so large masses of people are actually seeing the horrors in Gaza. If you watch the nightly news, you won’t see that content. If you go to YouTube, you won’t see that content. You also will barely see it on Reddit (which literally hired someone that worked at the CIA to be their community manager person lol). Do your best to dissociate your online activity from your personal identity. Use a good VPN that you pay for with cash or a proxy system like a voucher that can’t be traced back to you. Use burner email accounts. Etc etc.