

Any normal computer can become a “server”, its all based on the software.
Most enterprise server hardware is expensive because its designed around demanding workloads where uptime and redundancy is important. For a goober wanting to start a Minecraft and Jellyfin server, any old PC will work.
For home labbers office PC’s is the best way to do it. I have two machines right now that are repurposed office machines. They usually work well as office machines generally focus on having a decent CPU and plenty of memory without wasting money on a high end GPU, and can be had used for very cheap (or even free if you make friends that work in IT). And unless you’re running a lot of game servers or want a 4k streaming box, even a mediocre PC from 2012 is powerful enough to do a lot of stuff on.
Bigger hammer and a concrete surface. Three good whacks to the thin sheet metal casing (opposite the drive motor/PCB) should shatter the platters inside.
You can also buy a sharp punch that looks like this and punch thru the sheetmetal side to really get those platters broke.
Realistically if they’re already failed, nobody is going through the effort to send these disks through any kind of speciality recovery for a random john q public anyway.