[trestacos]

I think another option here is for email masking services to allow other services to ask if a user has registered at their site before. Details: https://dev.to/stephensisk/throwaway-email-blocklists-want-t...

I'd be happy to work on building that for my service if someone is interested in using it.

I think your point about mozilla's pricing being too cheap is an interesting one. I don't think of the pricing as $1 - I think it as $1/month, so it builds over time. But clearly it would be a bigger deterrent if it cost more.

I think blocking these email masking services and treating them exactly like throwaway email services is the wrong way to go since I think a lot of users want to use something like this. (discloure: I'm working on https://www.thxnothx.com which is also an email masking service combined with some other features)