

Tell them to turn on fediverse sharing in the Threads account they already have.
I can already hear “No! Not like that!”. Fair enough, but that’s the thing most of your non-technical friends will actually do if you ask them. Be sure you have an account somewhere that can interact with it. Perhaps some will get interested enough to make accounts somewhere better.

ActivityPub doesn’t work that way, but you can follow public Mastodon accounts using RSS.