Most of the criticism Zen gets about “security” applies to every browser except librewolf and tor. Zen is as secure as firefox is.

Most browsers don’t claim to be more privacy conscious than all the others and leave all the telemetry enabled when they do.

I’m pretty sure the US has a law that requires people to stop texting you after you send STOP. Additionally, service providers like Amazon will just remove subscriptions if they receive a STOP.