> it's the model where Google is giving money to the sites you visit, in proportion to the level you visit them
Is it, though? Perhaps a closer inspection of the payment model is in order. I found this:
> You’ll pay the market price for each ad space that shows a thank you message or pixel pattern. This price can vary a lot. The exact price is determined at the time of the Google ad auction.
Further details are here:
https://support.google.com/contributor/answer/6084026?vid=1-...
Essentially, you are bidding against a website's advertisers and paying the going rate for that ad slot. Not all content is equally valuable to advertisers. Consider the high cost for cancer targeted advertising compared to targeting an audience for, say, some form of generic cola beverage. The page with the cancer advertisement will receive a higher portion of your Contribute budget than the page with the cola advertisement (if it's replaced at all.. Google may decide they get more money with the cancer-related ad than with your Contribute bid).
So, it doesn't seem to distribute your money in proportion to your level of visits. If you visit a single site more frequently than others, then sure, that site may get a larger number of bites at your budget, but if the value of that space is very low then the total sum you provide to this content creator could be less than what you give to the owner of the click-bait link you followed once and forgot about.