I'm already seeing EEE (Embrace, Extend, Extinguish) user experiences from Threads/Bluesky on Mastodon. People are responding to content from there, linking to content there, but if you aren't on the other platform you don't see the content, the links don't work, you can't see what they're replying to, etc.
By embracing connectivity to these platforms, the Fediverse is choosing to be a second class citizen on corporate platforms.