I use DO because it's simple and easy. I got tired of dealing with AWS corporate-sized crap, all I want is to spin up several servers using terraform and get work done. They way you can automatically apply firewalling rules to server tags, for example, is exactly what I need.

And don't even mention Azure, where I feel like in a huge maze of mirrors. Nothing is simple, and you waste lots of time on clicking and figuring things out.

So yes, DO has very real value, and I'm glad they exist. The only roughly comparable provider I found was Vultr, which I like quite a bit, too.