Maybe the color blue? Other than that, both sites look follows the generic tech website layout.

Digital Ocean's website is following a pretty standard design trend that has emerged over the past few years, the long scoll page with numerous horizontal sections. Lots of sites look like that these days.

There are far more differences than similarities. I would analyze them more before making an accusation (didn't sound like you were just trying to harmlessly point out the similarities).

I think it is pure coincidence. It is because of current design trends, this is ok for current websites to have this layout and design principles.

Can't say Digital Ocean was ever looked at when we designed Layers I'm afraid.