Whilst it's theoretically possible for a free host to install memcached as a separate service on different ports for each of it's users (which I think is the point harry007 is trying to make). Let's face it, this is never going to happen. Free hosts provide users with very limited resources and usually have thousands (maybe tens of thousands) of users on each server, they're not going to provide memcached for every user. Nor will they install it upon request, you get what you pay for and in this case you're paying nothing so why would they install it for you?
Most tracker owners tend to realise pretty quickly that a free host is useless, use shared hosting until they get kicked off that due to eating up all the shared resources, move to a VPS or dedi by which time you may have received enough donations to finance the move. If you need to install a service then the only real solution is to use a VPS at the bare minimum although if you're lucky a shared host may accommodate you upon request. (Very unlikely though).
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