I'm not sure I see a value in that. The same effect is achieved with any web meeting these days, and with them I'm not locked to one service.
I guess the difference is that they can actually use and browse the site exactly as it is, on any device. You're not really locked in either, you can just stop using Pingy and go back to whatever you used before.
And if you remove that, what is left? Automatic deployment? Mmm... a script with tar/gz, scp, tar/gunzip would do that for free and much more flexible than a third-party service.
What about minification? HTTP/2? SSL? Server redirects? They are all completely possible to do with other services but there's a lot involved to get it right. With Pingy it just works out of the box. Also, Pingy is much smarter than a tar and upload script... If you do a deployment and then change a file before doing a re-deploy then Pingy will only upload the minimum set of what needs to be uploaded.
I'm just wondering is the service really provide enough value.
I guess I'll find out soon.