I used the card and was granted 1% interest for 1 month but can't figure out where to collect interest anymore? Bug or am I just confused?

- Interest was removed last August, so the Morty Cards are effectively useless now.

Why are they still redeemable and prompt that you get 1% additional interest shouldn't this have been removed months ago if that was the case?

Excellent question. :P I think Morty Cards were glitchy for a while, and most people (staff included) eventually forgot about them.

Are you able to remove the use option on these?