Even if the code is harmless now, the language used in the T&C is concerning since it essentially gives you free reign to introduce invasive mandatory telemetry at any point in the future.

Sure, the code is free, anyone can fork it but I find it hard to believe someone else will maintain a fork of a fork of a web browser.

Also, the p2p functionality can be restricted in "forked" builds that do not comply with new mandated telemetry by making protocol changes that impede interop.