The first one ripped our entire site and simply changed all the texts slightly, and also the look of our system. But, it was oddly different code - why copy the look completely (including our graphics) if you are going to write a new system?
The second one, done by a somewhat semi-famous person at the time, copied our minimal, custom forum. I have no idea how much work that must have been to port Vanilla to look like ours. Friends asked me if I had joined their team which is how I found out.
I never publicly said anything which chewed me up for a really long time. Both of those projects failed long ago. A copycat likely also won't know how to do other things for themselves and you can bet that they won't know how to execute their project when things get serious.
Cushionapp, you're doing it right. Make your app as innovative and unique as you can and just keep doing your thing. Never bother looking at their site/app again...