It seems useless to me, at least regarding the cybersecurity aspect. Of course, it’s helpful when people ask for my contact information, and I don’t want to share my phone number or email address.
But they still require information that could be used to prove or be linked to my identity for registration, right? This means a hacker could still reveal your IP address, phone number, email, and your passcode. Likewise, the development team can access these as well.
I know I’m overly cautious about my privacy, but that’s just how I am.
Would allowing third parties access to their server API just cause spammers to flood signal users.
They can already do that. You can make custom clients that pretend to be the real one, it’s just against their terms of service. Spammers generally don’t care about the ToS though, so it’s just legitimate users that are affected.