I mean, whoever has an old pc, a 386 for example, can use it to do useful things ... maybe let the kid play with it ...
386, 486, I believe that only collectors will have it, and they will prefer to use systems from the same era
maybe companies with old equipment that are still in use and need systems and don't work with current computers, but in this case it must be a difficult task to adapt all types of drives and programs
giving children to use is quite wasteful, due to the space occupied and energy spent,
being that there are many more current hardware but that have lost their processing power to new technologies
in this question you have to know what you want to do with the computer and what is able to run on the system
I have an all in one myself, it's running win7, it runs GTA SA very well, hd movies, among other things, but browsing the internet is very bad, practically impossible, and I've already tested several OS and several browsers
It's pretty much a matter of internet technology these days