>single core Linux VMs... i can't say about that specific thing but i've been using this daily 24x7 for the last 2 years now. it connects my 20+ pcs and laptop

>single core Linux VMs... i can't say about that specific thing but i've been using this daily 24x7 for the last 2 years now. it connects my 20+ pcs and laptops which are geographically apart but because of zerotier, they are in a local lan. it does not have SSO, relying on the admin accepting/rejecting connected devices by a single checkbox. this is in comparison to tailscale which uses Oath, meaning you have to create and maintain those accounts as well.