I don’t think that’s the case. The v0.19.0 release notes say:

Instance Blocks for Users

Users can now block instances. Similar to community blocks, it means that any posts from communities which are hosted on that instance are hidden. However the block doesn’t affect users from the blocked instance, their posts and comments can still be seen normally in other communities.

Vote here and leave a message to let Proton know how important a Linux client for Proton Drive is.

Assuming that you’ll take advantage of the extra Drive space, that’s two services (since Calendar is part of Mail), so I think subscribing to Unlimited would be worth it for you.

Try out the free versions of the apps and decide whether you would pay for at least two of them.

Since I already use other alternatives like Bitwarden for many of Proton’s services, I’m only using Proton Mail and I can’t justify subscribing to Proton Unlimited until they release a Linux desktop client for Proton Drive.