uname@pm.me and uname@protonmail.com should count as ONE address, not two
Currently, if somebody wants the addresses uname@pm.me and uname@protonmail.com, they both count toward the address limit even though registering EITHER as an alias prevents the other from being used by anyone else.
Instead, the limit on paid accounts should, for example, be five usernames and not five addresses. So if you were to register:
uname1@pm.me
uname1@protonmail.com
uname2@pm.me
uname2@protonmail.com
that would be two addresses, not four.

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anonym commented
I agree, adding to this i think that protonmail.ch should also be included, like this:
uname1@pm.me
uname1@protonmail.com
uname1@protonmail.chthis should be 1 address, not three.