Yes, but it gives them a lot less to work with. Parler doesn't just require an email address, it requires a phone number. The email can track it back to a certain IP for the majority of people which can point to a physical address. The phone number has an actual name and address tied to it. Gives them more assurance as to exactly who somebody is. It's not about safety or gatekeeping, it's about data collection. People are far too willing to give away tons of information or permissions on their phones these day.