You don’t really need the sever at all if you have another phone in your family that can send a text message. Now that I think of it it might not be a bad idea to set up a sever as backup. But the public sever from the developer should be fairly safe to use as well…

Another option would be to install an im server that is low on resources and not eating your sdcard. I think xmpp would work a lot better on a pi. Prosody, ejabberd or snikket should work nicely.

They technically already get 300 Dollars a year out of you without you ever subscribing so who’s laughing now?

Ditto.

There is no need fire up a dedicated machine to do this. Use your router/ap running openwrt and connect a hdd via usb. The machine needs at least 128 Mb RAM (256 mb would be better). Install the transmission package, set it up, add a gig of swap space on the hdd and you are good to go. The AP runs 24/7 anyways so there will be very few extra power consumption. Vpns often don’t allow port forwarding (mullvad has stopped support recently if I remember correctly). You can just be a passive node and not often ports, that should work good enough. Consider seeding parts of sci-hub. it’s a project worth supporting imho.

You can just download once of the parts below with less than 12 seeds and set it to host without ratio:

https://phillm.net/torrent-health-frontend/stats-filtered-table.php?propname[]=seeders&comp[]=<&value[]=12&propname[]=type&comp[]===&value[]=scimag

Maybe try the searxng matrix support chat, I think there might be a few developers around that could point you in right direction:

https://matrix.to/#/#searxng:matrix.org

They also have a Mirc support channel is that is more your cup of tea.

I would try to find something a bit newer. Core 2 Duos are really power hungry. Find one with an i5 processor and a T at the end of the number, like i5 3450T or something. This will be a little less performant but run at 30 watt max compared to the core 2 duos 150 watt. Fujitsu esprimo are also a good cheap option and both lenovo and Fujitsu offer rather tiny pcs that work excellent for severs.