I’m not sure that needs specifically pointing out because nowhere in the title nor article does it call this a donation. It’s clearly described as an investment.
The end result is the same though: everyone who uses FreeBSD benefits from this investment.
Motivation can be important. After Mozilla started taking Google's money they lost a lot of urgency about competing with Chrome to offer a different view of the internet.
In this case there don't seem to be any concerning dynamics and generosity or lack thereof is irrelevant. It'll be good for FreeBSD.
How could Firefox as a company afford to compete with Chrome or do anything without any revenue? Unfortunately Google's money is almost the only reason why Firefox is still a thing...