Still, the archival nature of decentralized communities is one of the primary objectives of the technology. It’s arguably the defining feature of any decentralized thing that no one controls everything so things are meant to stay “forever”. Otherwise Bitcoin would be completely ilegal since there’s no way to delete information there.

Any number of people here will happily tell you where to shove your illegal technology. In truth, the GDPR is explicitly meant to limit what may be done with existing technology.

With crypto, one can make use of some existing exceptions and perhaps create compliant apps. I'm not familiar with those. Much that stuff is not compliant. There isn't a lot of enforcement.

So that's my bad. I pointed out the issue with the right to erasure to highlight the problem, In truth, the probable violation happens when the data is shared. With e-mail, the user sends their own data, just like while clicking links. The transfer of data for lemmy federation is under the control of the instances involved. It might still be okay, like serving the data over the web. But that requires the user to know what's going on.

If you could hand-wave these problems away so easily, Meta would not be paying those huge fines. What do you actually think that's about?