Unlimited Zerotier/Tailscale access WG server on GL routers

Is there a traffic volume restriction on the free basic plans of Zerotier/Tailscale when using either service to route traffic through a WireGuard server on a GL router or is it unlimited?

Zerotier/Tailscale traffic limit is determined by their website, https://tailscale.com/ and https://www.zerotier.com/ you can see related information.

I checked these websites before asking and couldn’t find any info on traffic volume restrictions.