@BeAware I've just found this out & am not very happy about it
Anyone who personally blocked threads.net hasn't actually blocked it, they've muted it
Only instance admins can block another instance (defederation)
Muting stops threads.net posts appearing in your federated (world) timeline, but you can still see them if you look& afaik your public posts will appear in the threads.net world tl
So if your instance admin hasn't defederated threads.net their users can see your posts