Hi there,
I can tell you for sure that we only remove the games when the editor or right owner asks us to remove them, so don't worry, you don't have to rush, as I don't think a lot of editors are planning on loosing their IP rights

But, it does happen, like it did for F.E.A.R. because the original rights holder lost their rights. fear not, as we do try our best to get the rights from the new owners though, so you can promptly resume playing the games that have slipped.
But, really, this seldom happens...
So enjoy, take your time, why not even discover games you'd never thought of playing...
MetaShane