but there is also the possibility to connect to any pool and undermine any crypto with the same "algo scrypt"
Yes you can and as jstefanop has written its possible to any pool and you can also point your miner to nicehash if you want .
The only problem on Nicehash there is only to get a lot of shares , but you get some and any scrypt pool that you find you can mine there .
I have the apollo miner now since it was coming out and never got any problems with it .