What makes this forum unique?
This thread is over a month old and got no responses until today. Strange.
I'm just going to answer the above question by stating the obvious: signature campaigns and bounties. There have been other forums started around ICOs and such, and they've failed because they recruited shitposters from bitcointalk who expect to get paid to post. The most unique thing about BCT is that you can use your signature space for advertising, and that's drawn a LOT of people to the forum. I don't think any other discussion forum has anything like what bitcointalk has.
The other unique (and extremely important) feature of BCT is that Satoshi was one of the founders of it, and since his posts here still exist, there's an enormous piece of bitcoin history still available for everyone to read--and it was the first bitcoin discussion forum as well (if I'm not mistaken).
But with more interest in crypto use, do you think there should be an alternate forum?
Ah, the insomnia is in full force so I'll give an answer to this, too. No, I think bitcointalk is enough of a forum for anyone who wants to discuss bitcoin. There are other boards for altcoins like Dash, and I think there are more for some of the bigger altcoins, too, but as far as bitcoin goes....we don't need another discussion forum, nor would another one be as successful as this one if it didn't have signature campaigns. It's a somewhat sad fact, but it's true.