Nothing demotivates people like a half assed reward. If you want something never to get done, offer a bad carrot. If you want only one thing to get done and nothing ever again, offer a good reward but then make the recipient fight you to get it. I thought pizza parties were the worst, and then I got an award that was announced but not delivered, and spent almost eight hours over the next month poking people to give me my goddamned prize. It became a second job and at the end I ended up resenting the entire experience.
Later at another job when we in theory had a generous reimbursement process that was actually a ton of red tape, I had flashbacks to that incident.
Also don't assume we don't know our coworkers, when they first got to 8 in a row the slack channel looked like the Twitch chat of a popular streamer.
We have the buy-in from management that if it happens every day then it happens every day.
We are planning to change up the food if it ever happens again, pizza party is just a good title