The permissions on their extension allows for them to read site data so they definitely could operate as a data broker. However their tos has no mention of any data sharing so you are likely correct that they just take a commission. Great site imo

If you have multiple extensions installed honey always secretly steals the revenue from competitors without asking for consent. Most other extensions will ask if you want to activate cashback. Honey just disables their competitors and steals that affiliate revenue. It should be classified as malware

Topcashback consistently beats honey and others out (almost all competitors beat honey btw). And they pay out and have customer support. Easily thr best way to sell your personal data to a shadowy data broker