Given what we've learned about illegal and secret government surveillance from whistleblowers like Edward Snowden, I wouldn't trust a megacorp any more than "a random person".

The government already has the keys to all the megacorps' kingdoms. The only possible way to protect your data is to make sure it uses client-side encryption, and that those encryption keys never under any circumstances travel over the internet.

You should assume that any information you give to ANY site is readily available to all major world governments.

Keep your private messages on end-to-end encrypted platforms like Signal or Matrix. Consider everything else public.