Tor has had zero telemetry since its inception and I’ve been disabling telemetry in Waterfox for as long as I can remember - which is almost 15 years.
There were Firefox forks before that as well doing the same thing.
There were Firefox forks before that as well doing the same thing.
links, w3m, and maybe even dillo have any telemetry? I would assume they could make your list of "real no telemetry browser".