Dave Winer responds to my post about Threads and account migration:

Right now Facebook is hoovering up people who are looking for something new in the Twitter space. So it helps to encourage people to believe that there will be a way out if they want to try something else. But everyone knows for real that that isn’t what’s going to happen. This is in the tech playbook. When you’re growing, you want everything to be open.

Unfortunately he’s right that Meta has a very poor track record with APIs. I’ve been burned by this and many other devs have too. We’ll see if Threads is different.