Very late reply but I've been running UBPorts on a Fairphone 4 for a couple of years and the camera works fine (besides very oversaturated colours in photos, but I'm not sure if that's a software issue or the phone itself)
It's also absurdly lacking in features compared to Android/iOS (never mind app support) and the dev team is so small they can barely maintain existing device support. VoLTE is still unsupported in the majority of devices. The OS doesn't even have basic security features like drive encryption
I like UBPorts a lot but I think the alternative/FOSS smartphone market is too fragmented between it and SailfishOS/PostMarketOS that none of them will emerge with enough adoption to be real competitors to the iOS/Android duopoly. Didn't mean to be overly negative. Just my two cents
Security/privacy. With a dumb phone you're restricted to standard phone calls, SMS messages, and (sometimes) email. All of which are ancient standards that weren't built with security in mind. Your network provider likely keeps logs on your calls and texts
You can also take a complete backup of the iPhone using macOS’s Finder (the phone should popup there as a “drive” once connected via cable) and then backup everything to a HDD/SSD via TimeMachine
Just to piggyback on your comment, it is possible to directly back up an iOS device to external storage, but it's not officially supported. You have to create a symbolic link from the default backup location (~/Library/Application Support/MobileSync/Backup) to the external drive
This is the real problem. As more and more countries push for laws like this I think sites will just adopt blanket age-verification for simplicity's sake instead of having to constantly keep track of which countries/states in countries require it
Friendly reminder police in the US are legally allowed to steal money and possessions from you