When I pointed out that that makes no difference…then you switched to another reason.
It’s not another reason. It’s the same reason.
If it wasn’t encrypted it would be trivial to spin up a local integration like Google or MS already have.
Since it is encrypted, it makes it significantly more complicated to develop. While this development may make sense on MS or Mac, it doesn’t on Linux, because it requires more resources and serves a much much smaller number of users.
I’ve already explained all of this in the previous comments.
My Proton Vpn on linux install works
“Works” is right. Like I said, it’s extremely basic compared to it’s MS and Mac counterparts.
the e-mail bridge works
Notice how MS and Mac get fully-featured desktop clients and all Linux gets is a “bridge” to connect to an inbox client developed by someone else.