why not just slap calyxOS or GrapheneOS on it yourself? it's honestly never been easier to do than nowadays, just go to a website and plug in your phone via usb, then click a few buttons, presto. then install an encrypted messenger app like signal.
There is not currently a way to differentiate between web crawlers that are indexing sites for search purposes, vs crawlers that are training AI models. ANY SITE THIS SOFTWARE IS APPLIED TO WILL LIKELY DISAPPEAR FROM ALL SEARCH RESULTS.
it's similar with amazon/booking - if you use their share button, you get a neater shortened url but tracking is baked in. but you can still just copy the url from the browser search bar instead (which, acknowledged, might particularly not work well for IG)
i did get it to work, but after coming back from hibernation the system would be slow and unstable, so i stopped using it. it's a shame we can't have this on Linux...
aww c'mon surely you know at least one person who has a laptop and would lend it to you for 20min