When you say that there is no technical way, you sre referring to users not being able to block instances right?
If it’s that I don’t think it is that difficult to implement, Mastodon already allows for that. And also the app “connect for lemmy” in its last update has given the option to block instances user level, I don’t really know yet if it blocks all users from that indtance from appearing or only communities as I haven’t tested it yet.
Regardless to say, if we can get the appropriate tools this definitely could be a decision for users to take, if we make it so that they can completely block any and all content coming from a big instance.