I bought my Pixel 8a like a month ago for 380 euros and the first thing I did was install GrapheneOS
I only stayed on the stock system long enough to pull all the updates and make sure all the hardware worked just fine so I don’t know what I’m missing out versus stock ROM but so far it works absolutely perfect.
I compiled the system and kernel myself since it makes sense when you are installing a security/privacy centered OS and it instructions worked without a hiccup.
I have three users for compartimentation in my setup.
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Owner user only has source available apps compiled by myself barring Firefox because its a pain. I run Shelter to create a work profile where I have the sandboxed Play Services for some critical proprietary apps that I need notifications from.
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Games user is self explanatory. It’s not allowed to run any applications in the background and I am just there logged on my google account so I can get some of the subscriptions I pay.
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“Swamp” user. It’s not allowed to run any applications in the backgrouns either and I just use it for bottom of the barrel apps like Discord, Instagram… to stay in touch with some irl friends.
You can also disable app install and update for each profile and instead just apply them directly and manually from the owner profile.