>>14,15I once got phpshell on PaaS or 000webhost and got it to compile and run C.
But I was noob at unix at the time (2017) and didn't manage to exploit it further.
I found out the architecture and downloaded binaries into it, without need to compile. One problem was the PaaS kept resetting the directory every time it woke up, but I now think this was easy to solve.
Maybe I coud have run a scheme webserver on these free and lame sites, or whatever other language.