I am not sure if people are using claude design, security review stuff and other tools they have built so far.

Building is the easy part. There are lot of service level stuff that I am sure anthropic will not be able to provide, therefore they are trying to partner with other orgs in that realm.

I am very skeptical about their stuff now.

If you are builder, I believe you should avoid anthropic, it can be default to monopolistic behavior, I am not saying they are doing it, but they could, where in they see what you are building, if you have traction, position a product in that realm. Just saying.