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I wonder if Proton can implement a special NDR 550 message that users can configure on their email account.
With my own self-hosted email server I was configuring a 550 NDR rejecting message to all spam lists with the following message:
If you want that this email to be delivered correctly to the destination, please pay first this Bitcoin LN invoice of 100k sats (insert LN invoice string) or send to this LN address with the comment "I want to be removed from spam".
The spam will be more less if you create your own lists and use only specific whitelists to receive on your own domain.