I had a long comment but @criss_cross added more context than I could. To summarize, there is infrastructure in us-east-1 that can take you down even if you host in another region. Also lots of stuff there and closer=faster=better.
I find Fedora provides a great balance between new code and stability. I've had lots of trouble getting distros like Ubuntu to work with newer apps and features.
If you want to connect a device to your phone and have it use your phone's tailscale connection to your tailscale connected PC you'll need to have a way for the device connected to your phone to reach the tailnet.
By default this is not enabled. Only tailnet devices can reach other tailnet devices.
You'll need to setup some tailscale device as a subnet router -- either your phone or the PC itself -- to allow traffic to hit the tailnet. You'll also need to add your PC's LAN to the subnet router to advertise the subnet across tailscale. https://tailscale.com/kb/1019/subnets
If you're buying instant coffee you have to do a dalgona at least once (probably just once)