For people who roll their eyes when someone mentions Linux and all of the free and open source projects adjacent to it (including Firefox!), this is exactly why many people value those things. We actually can have freedom in computing and it's worth pushing for. We don't have to roll over simply accept what Google, Microsoft and Apple want.
GPL is designed to protect developer rights, not user rights.
If google packaged your linux distro and sold it through the play store bundled with their own apps and sandboxed everything and called it chromeOS, your rights would not be any better protected.
Security and privacy involves users making informed choices to protect themselves, full stop.
Any of thousands of people can say this but i don't see it in the comments below so: I've been using a Linux Mint / Windows dual boot system for over 10 years and love it. I think a lot of people see Linux as highly technical, but versions like Mint and Ubuntu are more carefree than Windows nowadays.
I'm aware, but ultimately they're still an ad company that uses technology to sell more ads. Any minor aspects of altruism (if it can be called that) can't wash that away.