Your local public library is a great resource for this, if you have one. Most public libraries host classes, and even those that don't will know of community colleges that do. :)
There is a known strategy called EEE (Embrace, extend, and extinguish).
First, they embrace the open web. Millions of people who never would've joined the Fediverse (and, probably, don't even know what the Fediverse is) flock to Threads and start to interact with us.
Then, they extend the open web, adding features to Threads that aren't compatible with our servers. People on Threads don't understand what's wrong with our server (even though it's Threads that's the source of incompatibility).
Finally, they decide they're "having trouble maintaining compatibility with third party servers" and start to break off from us, leaving us with no way to interact with our new friends. Unless, of course, we make a free Threads account...
Google Talk is perhaps the most relevant example of this. Here's more details.
NTA but unwise. As others have mentioned: they'll look into who used those stolen miles and, assuming you gave them your real information, they'll send the heavies stright to your door.
People from other instances can and do use our communities and are affected by our admins' decisions. So to say they have no real stake in the matter is not entirely accurate.
That said, there are certain decisions they have no stake in, for example the debate of whether we defederate with x, y, or z.
The price of food is ridiculous. £1.70 for a bag of smartprice sausages whose first ingredient is "water"? Absolute state of it.