Why forever?

Because we leave at your disposal the space dedicated to you in the site, in which you trained and you learnt and everything you whote and did in it. Forever. 

Whether you had signed up by yourself or had been registered by your teacher or by your company, the gist does not change: that space on the site will be yours forever.

In other words, even if your subscription had expired, everything you did remains, at your disposal. Simply you will not be able to use it until you sing up for a new subscription. Then you will be able to pick up where you left off, even after decades: as if time had not passed.

In short, storing your own language skills inside Canto26 means you do not lose them, ever. It means that in every moment of your life you will be able to go on with what you had left hanging.