I tried Loot.bet once but Sportsbet.io is a new one to me. Loot.bet is often advertised in some Esports betting sites that doesn't accept crypto so I got curious and checked it out and overall experience I would say is pretty good.
Loot.bet is just like other fiat based sites but sportsbet.io and other crypto-sportsbooks actually have the same odds provider from what I have observed and the odds changes and markets are the same for all of them.
If sportbet.io covers the matches you are looking to bet on, then you should settle with them because they are one of the best sportsbooks we have here in the bitcoin community. There are others as well which allow betting on sports with bitcoin, but sportsbet.io are still ahead by significant margin.
Check it out and most of the games you'll find out that are active are casino games. They have various games and even live virtual sports but esports have been removed.
And with their signature campaign, it's been a long time since they've conducted one in the forum. We don't know if they'll run one again in the future.
Interesting why they stopped sports betting services, I have heard there are players who were taking advantage of the wrong odds and things like that with bitcoin sports betting since most of the sites don't require KYC so they can just cheat and run away and make new accounts to scam again. I wonder if that was the reason why they stopped sports betting, players cheated them too much I mean maybe. As for the signature campaign, I don't think it is much of a concern since not site spends the marketing funds in the same manner for a long time.