that is confidential but you'll be informed before signing on the contract so don't worry about that if you don't like the rates.
in case of non-exclusive deals, you can just leave at any time and they'll take down your work. the IP stays yours as they only have publishing rights on their platform. pretty sure the terms gotta be much different for exclusive deals.
for a platform that has barely been around for a year (or less) i think they're definitely booming!
it has a bunch of stuff to iron out, but overall their library is growing by the day, their audience engagement and incentives are to rival at least Tapas, which has been around much longer. and might i say, their staff are quite responsive and patient too.
And the fact that they've been contacting a bunch of different creators is a good indicator they're aiming to diversify their type of content too.
iunno, i think it's a good deal especially if you're a small creator and hoping to get paid for your work. you can end the deal any time and pretty much got nothing to lose for the non-exclusive deals.