Correct, there are many web content filters out there, and in many countries by law Internet providers must have them enabled by default,
I don't have an issue with browsing the Internet, but I do have a very big problem with bad content.
I think it's a pretty basic request, I mean all big Tech companies either provide their own (e.g. Apple's Screen Time, Google Play Store Rating, Safe Search, etc.) or at least provide you with the tools to do it somehow.
So obviously, there is a genuine need, and there are many people who want to keep themselves away from all bad and immoral content, each for their own reasoning.