I mean obviously they just need to be legit and payout when they should. Don't lock accounts incorrectly and make it easy for people to get money in and out of theor account. Start with a small group.offer bonuses to draw people in and just be legit. It's pretty simple.
That's a good start, fast payout, and no locked accounts in question unless the reason is really valid and sites can show proof of irregularities. Sometimes, users really need to risk some of their money when testing a new sportsbook if the bonus is really catchy and interesting. Without those good promotions, users won't take a risks.
If at some point a user is really doubtful even they want to taste that good promotion and bonuses, no choice for them but to wait for more days, weeks, or months just to collect reviews from anyone to see if the site is responsive to the community.
Having an ANN thread here is a must for any new sportsbook. It was the gateway for open communication between the site and users.
Yeah definitely and need to be very responsive. Nothing is more frustrating than waiting for admin to get back, hire communication people to deal specifically with all the customer questions and requests. Not that that is the end all be all but I steer clear of any site I can't get a hold of someone in a quick manner.