It's about risk mitigation. Vast majority of public WiFi users use them by direct connection phone,computer-public WiFi.
At home you probably have router, maybe even private.
Do you disable all connections to GrapheneOS servers? You are afraid of Google servers and you're OK that GrapheneOS and all who are capable to monitor Internet traffic can monitor you?
Using GrapheneOS you're like a beacon.
Even if you use different profiles for different apps data brokers can connect you using unique phone ID.
Don't pay for VPNs just use Tor instead.
If you need an email look for e-mail provider with POP3, imap access.
Start using GPG and keep your keys locally.
Try delta.chat
For IM try use xmpp (consider self hosting) or simplex.chat
Notes by 87e2d95f | export