To further add to this, it's not necessarily the fact that they take a service charge that I take issue with. It's the complete lack of transparency up-front and only once you're close to getting on the program that it's ever disclosed.
Would love to put up the accelerator you're talking about with clear information so future entrepreneurs applying can know about this upfront.
If you contact me at hello at accelerat.io I'll set it up for you. Rest assured, it will all be 100% anonymous.
A good start might be submitting those details to (http://accelerat.io/). They seem to be tracking this.