I'm giving my grandma a bad gift this year to get back at her
What happened that made you want to do this?
She didn't appreciate my videos and prevented me from uploading them
Sometimes things can happen that make you angry with family, but you shouldn't hold a grudge. It is wrong to show that anger by giving a gift that would upset them. This could cause a larger rift between you and her,
It's my grandma, so what can happen. I'm just giving a shitty gift and she will put it away when she's done with it.
It sounds like you and your grandma just had a disagreement, and she probably barely even remembers that you were upset.  If this is still bothering you, you should talk about it with her.  Otherwise, gift giving is a time to show your affection and appreciation for all of the good times you undoubtedly share, not the few bad times.