The app store is also ridden with scams and crap. But the web is a horrible experience for normal people compared to apps, which the down voters here don't seem to understand, because they have adblockers etc.
Normal people need ad blockers about the same way they need clean water. I wish advertising was a viable revenue model for publishers, but it has been abused by large actors for so many years that large US government entities like the FBI recommend an ad blocker[1], and even the FTC lightly suggests it [2].
Many apps are also ridden with ads, can collect way more personal info than a web site, and unlike sites, it's way harder to block their ads. (E.g., installing a PiHole on your network vs installing a browser extension.) Altering an app is a DMCA violation of whatever cryptography they use; altering a web site is your legal right via extensions/userscripts.
