There's a reason most open source licenses say they grant a "non-revocable" license. But that doesn't mean that the copyright holder has to release future updat

There's a reason most open source licenses say they grant a "non-revocable" license. But that doesn't mean that the copyright holder has to release future updates under the same license, nor does it mean anything about their ownership of the associated trademarks (which you seem to be conflating with some kind of overall "ownership").