The website has become slow, so the server is the first suspect. Adding CPU cores or RAM, or moving to a more expensive VPS, seems like an obvious solution. Sometimes the configuration is upgraded, though, and the pages still take just as long to load.
Most people want to get rid of a cookie banner as fast as possible. “Accept all” is usually the largest button on the screen, while the alternatives sit behind something like “Manage settings.” So people click the obvious option without really checking what it covers.