Does anybody know if it’s possible for individuals to file complaints against Meta or other services that use pay or okay models? I know that some non-profits have successfully done it, but I wonder if people could do it to as a way to pressure regulators even more.

Yes, the nuance is that Facebook must offer an alternative that does not use personal data, even if it means losing some of the features compared to when you pay (either with money or authorizing them to sell your data).

I’ve been using ProtonMail for a while now and it works very well, they also offer a drive, calendar, password manager, VPN; you can choose if you want all the features or just email.

I also tried Tutanota and they do a good job as well, they’re a smaller company and don’t have as many features as Proton but if all you need is reliable, private e-mail, it’s a good option.