I think the conclusion was that they had to remove that for legal reasons, since technically they were already doing something that could be considered selling data.
The reason we’ve stepped away from making blanket claims that “We never sell your data” is because, in some places, the LEGAL definition of “sale of data” is broad and evolving. As an example, the California Consumer Privacy Act (CCPA) defines “sale” as the “selling, renting, releasing, disclosing, disseminating, making available, transferring, or otherwise communicating orally, in writing, or by electronic or other means, a consumer’s personal information by [a] business to another business or a third party” in exchange for “monetary” or “other valuable consideration.”
Don't get me wrong, even after this I still use Firefox and I think it's better than Chrome in the privacy axis. But it's really annoying that they're still trying to paint themselves treating your privacy as sacred when that's obviously not the case.
[1] https://blog.mozilla.org/en/products/firefox/update-on-terms...