This is called a Turing tarpit (https://en.wikipedia.org/wiki/Turing_tar_pit https://en.wikipedia.org/wiki/Turing_tar_pit): where a system is technically Turing

This is called a Turing tarpit (https://en.wikipedia.org/wiki/Turing_tar_pit https://en.wikipedia.org/wiki/Turing_tar_pit): where a system is technically Turing-complete, but in reality is too awkward to do anything useful with.