I think it's fair to assume that between foreign threat actors, the Five Eyes/other Western pacts, and the demand to make the line go up, there's no real anonym

I think it's fair to assume that between foreign threat actors, the Five Eyes/other Western pacts, and the demand to make the line go up, there's no real anonymity online. If they want you, they've got the means to get you. In reality that's really no different than the pre-internet age. If you don't want your stuff intercepted, you need to encrypt it by means that aren't trivial to access electronically for a major security apparatus. Physical notes, word-of-mouth, hand signals, etc. Also, you need to be ready for the consequences of what you say and do online should a state actor decide to allocate the resources to actually act upon the data they have.