DBs aren't time-limited for GMS.

Huh?!

I think the maximum slots you can have on one account is some number (i dont know it off hand), but you have to purchase character slots via cash shop to increase it... but even then there's a max capacity. They are saying if you are not already at that max capacity, you will be given a free slot. They don't just want to say "everybody gets a free slot" because if your account is at max capacity you won't get one because they are not increasing that max capacity.