At this point you should read your own link. From the description of how it works, it doesn’t sound like a critical part at all. It’s part of the plastic flair on the outside. The cup is still perfectly functional and insulating.
I guarantee you’ve used many things after a piece of nonfunctional plastic broke off.
If the bottom falls off I hope you’re intelligent enough to realise that your cup is broken
At this point you should read your own link. From the description of how it works, it doesn’t sound like a critical part at all. It’s part of the plastic flair on the outside. The cup is still perfectly functional and insulating.
I guarantee you’ve used many things after a piece of nonfunctional plastic broke off.