Optimistic answer: working on ads doesn't mean you agree with the level of privacy violations analytics involve these days, making those invasions of privacy technically impossible or illegal means you can avoid them without having to defend your stance against business interests (e.g. "but our competitors are already doing this and not doing it puts us at a disadvantage").
Pessimistic answer: technical countermeasures don't prevent these invasions of privacy but they make them significantly harder, putting companies with less technical skills at a disadvantage. Anti-fingerprinting protections hurt the bottom feeders while larger companies like Google can likely work around them.
Pragmatic answer: this wasn't really about the fingerprinting but the crypto miners. Ad networks don't like crypto miners either but blocking them is difficult so browser vendors are really just solving the ad networks' problem for them.
Pessimistic answer: technical countermeasures don't prevent these invasions of privacy but they make them significantly harder, putting companies with less technical skills at a disadvantage. Anti-fingerprinting protections hurt the bottom feeders while larger companies like Google can likely work around them.
Pragmatic answer: this wasn't really about the fingerprinting but the crypto miners. Ad networks don't like crypto miners either but blocking them is difficult so browser vendors are really just solving the ad networks' problem for them.