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Any site at all can sell out your information and the criteria for not doesn't depend on how new or old such a site has been operating or you the user just having to use it for the first time. Moreover, that you're using a site for the first doesn't make them liable of selling out your informations. We won't know even if the site we most trusted are the ones giving out our information until they are exposed. So no need trusting any centralized platforms be it old or new.
It is true that any site can sell out your personal data irrespective of how newly you started using them or how long you’ve been using them for your gambling activities. But when such happens, and you’re to scrutinize, you’ll not first point fingers on the old ones you’ve trusted with your informations for long when they’re not proven to be guilty and exposed of such crime.
You will definitely see the newest one as the prime suspect even though they also need to be proven before you blame them fully for intriguing into the trust you have for them to provide your personal information to them. In all of this, having our personal research on centralized platforms is important for the safety of our data they will have on them.