Technology
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Here's what I think: if they actually do everything with open standards and PGP by the book, why can’t they provide IMAP/SMTP access to everyone who wants it BUT add the disclaimer that you’ve to use a PGP compatible e-mail client and configure it to deal with the encryption… they could even configure their submission to refuse any email that isn't PGP encrypted to improve things further. The fact that they don't do this leads me to believe that they either a) aren't actually doing everything as "by the book PGP" and there might be security issues or b) they're "privacy" as a catch all excuse in order to push a bit of vendor lock-in.
Their market niche is privacy conscientious people and those same people tend be to computer savvy and I bet half of them would mind setting up PGP on Thunderbird and use Proton without a bridge. Everyone else could still use their apps, web or the bridge.
I had assumed their reasoning for not taking that approach might be related to metadata at rest, but it seems they don't use "zero access" encryption for metadata even at rest so I have no idea what technical justification they could have for not supporting IMAP with PGP handled by the email client. The fact that they restrict bridge access to paying subscribers only doesn't help them avoid lock-in impressions either.
Great find, even worse than what I was thinking. Like you I was also under the assumption they applied some kind of encryption to all metadata as well.