"Is there telemetry? Yes, and it is opt-out: set ANTE_TELEMETRY=off"

Opt-out every time is unacceptable. If you opt out once it should be enough. One accidental execution path without the right environment and you're spewing telemetry to spaghetti knows where.

> One accidental execution path without the right environment and you're spewing telemetry to spaghetti knows where.

That would also be true with opt-in by environment variable, though.

True, it would be better to have a mandatory policy in a system location like /etc, would could over-ride environment if specified, and a command line option to show telemetry status. But accidental omission is more likely than accidental opt-in.