> I'm not sure if anyone in HN has any useful advice in this regard.

Self host. It's still possible to buy computer hardware and install FOSS replacements for most/all of the services you need, and plumb it all through to your mobile devices using wireguard/tailscale. If you're behind a CGNAT you can proxy it through a cheap VPS that won't fuck you on bandwidth costs. Thanks to Proxmox, I probably have better uptime on my services than e.g. Github these days.

When it becomes impossible to get open PC hardware, I don't know. I like to think I will just stop using the internet for anything besides the bare minimum NPC type activities that are required to engage with the institutions of society.