It kind of is. For example, Edge will automatically pop up in the corner at checkout and offer coupon codes, most of them will never work, then they'll steal the affiliate revenue from whoever actually sent you to the site in the first place, or add an affiliate link where it didn't previously exist, so that the site now has more expenses that are just... paying Microsoft for no reason, making everything you buy more expensive in the long run.

It pops up whether you want it or not, it's convoluted to disable, it slows down your browser when it's running, it financially harms the shops you buy from, and it often just lies about having coupons to waste your time while pretending it's helping you.

If you're familiar with the controversy around the Honey coupon addon, there are a lot of parallels in terms of privacy, ethics etc.