I get the reasoning behind the whole invite system, but your team needs to understand that most punters get turned away by stuff like this thanks to which y'all are losing so many potential customers because of this restriction.
Also, connecting to my metamask wallet isn't as seamless as with sites like SX.BET and Polymarket. It's another big issue with your site.
I agree with you and personally I don't really get what they are afraid of actually. From what I have been able to see, you need to create an account and to make deposits into this custodial account in order to be able to place lay or back bets (and to make withdrawals to get your funds). So it's not fully decentralized for me and funds could theoretically be locked in the same way as what Dexsport is accused of doing for example, if I understand how it works correctly. It's maybe due to being a betting exchange and not a classic sportsbook I guess but I don't think many "bad actors" fixing matches would risk to get their funds locked there while fully non-custodial sportsbooks exist to be honest.
Small correction: If you use RBTC or ETH as your main currency, there is no central custody of funds. All funds are held in a smart contract and can be redeemed anytime without any possibility for anyone to block the transaction.