If reddit is still allowed (and it certainly was for a long time) then that is good enough for 90% of crypto users. Of those who refused to use reddit my paid/free offer for bitcointalk users got a decent amount of interest for a while, but that has tapered to a tiny trickle. That and the fact that Steem has been very widely covered and known since it reached #3 in market cap a month ago suggests to me that no big pent up demand is still there. Of course, some will still trickle in and an easy method of paid signup would bring some too. I just don't expect it to be big relative to the existing size and rate that cryptocurrency users are already joining. And of course as I said above this will become even less and less significant over time, if it isn't quite entirely insignificant already.
Anyway, if you have a Bitcoin-paid signup process in the works, by no means am I discouraging it, but I'm kind of agreeing with your earlier comments that a lot of growth in user base and investment are needed and I don't see a whole lot of growth coming from cryptos on the user side. On the investment side, possibly. I think the needs there are a bit different though.