It must not have been safe to do so, but I actually did it some years ago, and then I was not really too informed about the risk that is related to giving out personal information so freely without minding the outcome. That's why I said that the reason some people make mistakes is due to a lack of proper information. It was after I joined the forum that I properly understood the dangers of KYC.
I hope the platform that you used was a trusted one, as at least in that instance the chances your information could be sold or stolen gets reduced in a dramatic way.
Still, it is important to avoid sharing that information as much as possible, so if there are platforms that you can use that do not ask you to pass any KYC check and that are trusted as well, then it is way better to use those platforms, as a way to reduce the chances of our information getting leaked by some reason or another.