I would be more tempted to try this if there was a demo board that could be viewed and interacted with without having to sign up. I am wary of giving my email address before I can even see a basic example working.
It isn't the case here but site/app makings take note: this is why I never "sign-in using " so if that is the only option you offer I won't be trying your service/app/other.
For email I have a sub-domain set as catch-all and give out addresses in that to new sites. If an address starts getting junk I can just block it. If the sub-domain as a whole gets deluged then I kill it and start another (any site/app/other I continue using gets given an address on my main domain so I'd lose nothing, though I've never actually had to do that). Because it is a sub-domain it gets skipped by junk mailers guessing commonname@domain.tld addresses. Some sites have bad email address checking that rejects something@sub.domain.co.uk (I assume their regexp doesn't like the extra dot in the server name) but if someone gets that wrong I don't trust the code in the rest of their app so I move on.