The problem with a list like this is that a “bad website” is in the eye of the beholder. I’m not saying that there’s anything wrong with you personally not liking the Shopify or the Semrush blog. But I think that everyone else has their own calculus.

It’s the same reason why social media blocklists can be problematic—everyone’s calculus is different.

My suggestion is that you promote it as a starter and suggest that users fork it for their own needs.

Some kind of democratic process. Where membership and blacklist are both something arrived at democratically.

It could be simple.

Good?

Some kind of community notes consensus system could make sense here to find common ground. When a diverse set of people agree that a site should belong to the list, only then it is added.