Their device depreciation policy is literally just Google, they refuse to support anything that isn't a Pixel (because of the security chip, although as I understand it, there's other manufacturers who could probably work as well - Pixel is simply chosen because Google promised to open up the microcode on the security chip, which hasn't happened yet) and their stance on user privacy is so extreme that it gets in the way of user freedom - they literally offer their own SafetyNet implementation and are aggressively against rooting whilst refusing to understand why people root to begin with (the most common reasons is by far hosts based adblocking and their recommendation, VPN based adblocking, gets in the way of a normal day-to-day VPN or something like Tailscale).
(Relatedly - the toxicity problems of their community against criticism of GOS or even being interested in non-GrapheneOS privacy projects are well known at this point and with a smaller community, you're bound to run into something that isn't answered on the general internet at some point. This makes that component somewhat unavoidable. I've never seen a non-corporate, non-FSF run community be such extreme NIH types.)
For freedom, I'd moreso point towards projects like LineageOS.