

According to their privacy policy there is no telemetry: 1.1. No Telemetry. We do not collect any telemetry data.
According to https://github.com/zen-browser/desktop/issues/5947#issuecomment-2737211334 one of the issues is that Mozilla’s telemetry remains enabled which (if happening in secret) is bad and also dumb because Mozilla can’t even use telemetry of a very different browser.
Seems this is legal now. Keep this in mind, when the next video game decompilation project comes along because that’s also machine-generated material based on copyrighted released media. That must be equally as legal now.