Pricing seems strange. $20/user per month. But you'd need someone else to also pay so that you can collaborate. So $40/month minimum? Seems quite a barrier.
I haven't checked if it was the case, but organisation type of license with a pack of users could have worked well.
The first year's supply of hits isn't free, but it's pretty cheap if you cheat a bit, and you figure since you're cheating a bit it will be cheap forever so why not get hooked!?
I'm not saying it's bad, just I've worked at some places that do this and you know the company they are doing it to know they're doing it, but accepting it at the moment.
I wouldn't call it very specialised. Seems like a fairly general tool for visualising and manipulating GeoJSON and similar data? I actually need to create/manipulate a GeoJSON data set myself for a current project, so I think I'll try this out!