nothing about this is surprising in the slightest, as proton is still a legal entity bound by the laws of Switzerland it isn't some kind of magic place where everything is private
but this is a good example why the best way of having your info be private is not disclosing it in the first place
RE: https://bsky.app/profile/did:plc:vcepp6trx4vpe5ourxso4tjl/post/3mgdnv6s3ps2d
If you have a fediverse account, you can quote this note from your own instance. Search https://bsky.brid.gy/convert/ap/at://did:plc:nbfjoeficjzf3pejpontvril/app.bsky.feed.post/3mgecp4qx222f on your instance and quote it. (Note that quoting is not supported in Mastodon.)