I know it's not the product but is it a similar idea to this? https://www.amazon.com/Silicone-Reusable-Expandable-Dishwasher-Diameter/dp/B01BJ3B9WE

I have seen this product, to help prevent drink spiking but not made out of silicone.
https://www.amazon.com/NightCap-Scrunchie-Spiking-Prevention-Scrunchie/dp/B0961T3FJR