Perhaps not an outright scam but definitely a garbage site where you will lose out.

Waves is a broken and misleading platform.  At first glance you think there was some brains here to pull this off but the end user experience is a disgraceful disaster bordering on a scam. 

Scam #1 ,, you deposit BTC and you can't do anything, the platform suggest you got to faucet or a forum and beg for waves so you can make your first trade. you can't buy waves with your BTC because to buy waves you need waves.  bad start for a trader sending them to a facuet or forum.

Scam # 2 ,, no contact or support, they want you to post publicly about your problems on their forum with your address , what a dumb idea there goes privacy, one of the reason for using decentralized options is privacy. Second its a censored and moderated platform they control so you if you have a problem the public will never see it as they control this medium.

Scam # 3..  A BTC fee of .001 for a gateway fee..  Excuse me but after depositing BTC here and losing a percentage and then losing more of the scam waves token now I have to pay a gateway fee for using a blockchain to witdraw it and that equals almost $4 CDN . I pay that for 2 weeks of trading at a real site.

Scam $4 .. After being overcharged to buy the scam wave token the site still does not work and gives the error "Order not created"  ..  Now BTC is stuck, waves token is worthless and they suggest I go to a forum to talk about it.

 
The idea is pretty good but given how poorly #1 works you have to question the idiots behind this site.

Everything else is a dumb, untested, poorly designed and the warning signs are there for a disaster.