Actually, according to my count, there are 9 other companies in this space that offer deploy environments as a service, in addition to 6 platforms that also offer this functionality as part of the platform.

I've been watching this space closely, as my org is one of the competitors (https://www.tugboat.qa/) that has been around for a few years. We started out as an internal tool in a development agency in 2012, and released this service as a product in 2016.

It's interesting to see all the new offerings in this space in the past 12 months. There's definitely an education problem, so it's probably good for all of us that so many new services are popping up that offer this functionality, therefore drawing attention to the fact that it's even an option. But the space is getting pretty saturated at this point, which makes it more difficult for newcomers.