Has this strategy ever worked? Gitlab went public, but it's barely a fraction of what GitHub is.
Framework laptops aren't really all that big.
Maybe Android? But it had huge backing.
Lastpass didn't have a majority at anytime. And their decline is related more to thei breaches and horrible practices. They are trying to be relevant now. They offered my university free subscription for all students and faculty and still people don't even consider them. At least this is among people who consider password managers.
Also for bitwarden the controversy was about their SDK licence being proprietary but they re-licenced to open source [1]
GitHub is a social platform.
We would need mastodon for GitHub.
In any case you're right, if you try doing open source purely as a marketing tactic it may or may not work out. I think one good reason to do open source is because you believe it's more sustainable, or transparent, or just being decent to your customers.