The police can confiscate your servers. Considering some states are treating abortion as murder, I don’t think it’s unrealistic to say the police could raid your home and confiscate your devices just on suspicion.
The only thing safe against that is an encrypted device locked with a password, no biometrics like fingerprints or face ID. As far as I know, you can refuse to give a password under the 5th amendment, but you can’t refuse to unlock a device with a fingerprint reader or face ID.
I thought that ToS was just for their CDN?
You can also use Tailscale Funnel, it does the same thing and doesn’t have a limitation on what kind of content you put through it.