GNU/Linux users are mostly a bit tech-savvy users, big of IT like dumb users, they are easy to profit from, very moderately tech-savvy ones are just needed to pull more people in so offering a bit of services with a good enough quality and something to make the experience nice enough for a tech-savvy user (like YT or Google Search with a certain set of extensions to cut ads etc) is enough to have thous users recommend those services to their less tech savvy friends and the world of mouth do the magic. More than that might be even counter-productive if show a real tangible far lower quality to the aforementioned users like most single-company show software are: crappy and outdated.
Alphabet do want data from the masses, not much from a small cohort of smart users. Invest for them is not interesting.
Alphabet do want data from the masses, not much from a small cohort of smart users. Invest for them is not interesting.