Why does everyone make things that exist?

I see a lot of startups going into the hype cycle, which is understandable. But I also see so many webapps for resource planning, retrospectives etc. It’s either that, some AI thing, SaaS or something related to DevOps.

I see all this through ads or just looking at some local startups in my city.

Why does everyone want to make tools for making things instead of making a product in itself?

Seems everyone is selling shovels for other shovel selling businesses. Have we gone mad