Why not charge Tor and VPN users a small bitcoin fee to log in? Most of those users would probably rather pay a fee than use cloudflare. They already have to pay a fee to register.
A fee
to log in!? Are you serious?
N.b. that (a) the move behind Cloudflare at the end of November is absolutely irrelevant to
login issues, discussed separately since October; (b)
everybodys connections go through Cloudflare, for every connection to the site; and (c) Tor users (among others) are already charged a fee
to create an account.