You can review blocked instances here:
As for why? You’re absolutely right, this is often over political issues(drama, censorship, values, etc), sometimes technical ones, and there’s no guarantee that your instance’s mods goals are aligned with yours. In a healthy instance, you can search for the name of a blocked instance and find a relevant post about why it was blocked.
There are also blocklists: https://gardenfence.github.io/ I don’t know offhand if Lemmy.world makes use of them.
You can, of course, go to the blocked instance as a guest, to investigate or validate your mods’ claims, but a blocked instance will not shoot up on your page.
https://newrepublic.com/series/49/microsoft-three-mile-island-ai-nuclear
Nope. Very real.