Privacy Guides on Nostr: yes, the main benefit is that it's basically a guarantee that Proton will be able to ...

yes, the main benefit is that it's basically a guarantee that Proton will be able to keep operating as they do now forever, so you don't have to fear them being bought out.

For current Proton customers who like what Proton is doing, it's great news. If you don't like Proton already, I wouldn't expect this news to bring about many changes.