[tor-relays] [Censorship in Russia] Make HTTPS/Moat captcha more complex?

Hi there.

I was thinking, what could be the ways Russian authorities could get bridges to block. One of the obvious ways to do this is to grab bridges from Moat/HTTPS, but since that would require solving a captcha, this would indicate its strength is insufficient, or they are able to crowdsource/mass solve somehow.

The other thought is an attack via email. Can we do something with it, what do you think? -- Best regards, Space Oddity.