Please be aware that the above is a link that the OP will in fact get affiliate referral credits for. While there's no obvious problem with that, full disclosure would have been appropriate here. Alternatively, the generic link https://changelly.com should work as well.
Bittrex, apparently does list gambling and dividend coins...but it costs money for them to just review it with no guarantee. So no one had bothered.
Rudex stayed a gateway on the bitshares dex (decentralized exchange) and that is where most of the volume is.
https://steemit.com/blockchain/@blockchained/ann-rudex-is-launching-a-gateway-for-peerplays