A sheet of paper can easily hold 60 barcodes, and costs about 5 cents to copy. A pack of gluesticks is $1 and can handle hundreds of bottles.
This sounds like a dozens of dollars level scam, not millions.
> not millions
No, not individually, but if tons of people are doing it all day, it adds up.
And bumping the fee to $0.10 makes it $36/hour which is very attractive to someone who doesn't have a job.
Again, the actual earnings are lower, but I think it's a realistic type of fraud.
There is a viable way to do recycling fraud, but DIY stickers isn't it.