Let's say we all know about the Calendly app. I want to take the same idea, add some features, change UI/UX, etc. It seems like an easy way to make a profitable SaaS with an already validated idea, but on the other hand, It's just stupid to blindly copy-paste someone's product.
P.S. I'm in an agony of finding an idea for the saas project. For a long time, I tried to come up with a solution first and then tried to adjust it to the existing market (tl;dr; this is bullshit). Then I tried a so-called Sales Safari — failed. Now my ill mind came up with an amazing idea — steal someone's product 😕.
At the end of the day, I'm confident in a thought that you should solve your own problems, but it seems like I don't have one.