[siliconc0w]

Google is actually a pretty good example.

They provided a lot of value initially but now any remotely commercial query has only sponsored links above the fold. If you want to sell anything on the internet, you're probably paying them or facebook a hefty vig. They also used their position in search to push their other products, they make you pay to buy keywords for your own trademarks, they aggressively track you in order to build an advertising profile, etc, etc.

Enshittification is well documented in tech. There is some initial value or innovation and then it always turns into gatekeeping and value extraction.