They need to grow fast at the start, so they open up their service to almost everyone.. because they can gobble up the fees to fund and grow their service. When they have grown big enough, they have enough users that can adhere to the KYC requirements ..so they do the bait and switch maneuver .....by suddenly implementing full KYC requirements.
Casinos use the same strategy.... so it is nothing new.
It happen also with coinbase before where there user is free to use their wallets without forcing them to do KYC but now they ask this the same with Xapowallet and this implementation drive out their users and go to other service provider which didn't require any KYC upon using the wallet.
But somehow I understand why they do that since they are dealing money and maybe the authorities require them to audit their costumer and to comply those other necessary things to pass their regulation(Just my opinion only you can correct me if I'm wrong )