Fairphone are big tho

GrapheneOS is superior in many regards. CalyxOS is a more de-googled experience than standard LineageOS which it is based on with optionnal microG for better compatibility. LineageOS still have many Google blobs in it’s code even though it’s cleaner than every Stock Android OS in regards to privacy and third-party bloat.

It’s not that great privacy wise. Probably not as bad as YouTube but unfortunately it doesn’t seems to be their priority.

Bitrefill, CakePay and CoinsBee are plateform where you can sell crypto for gift cards and thus use them to pay online stuff in many places that don’t accept crypto. You can also use them physically if needed.

Another usecase for Bitcoin and Monero ! Pirate needs to be sovereign from state money !

I think you confuse security and privacy. Samsung are pretty secure from what I saw. They are not private at all however. You can debloat it with adb and maybe tools such as Universal Android Debloater.

There is a couple of guide such as this one: https://linustechtips.com/topic/1402380-ultimate-samsung-oneui-debloat-privacy-customization-guide/