Due to the magic of the Intarwebs, we can find out all kinds of interesting information. Such as Herr Rezezár is 65% owner of Fontus Water Technology GmbH and has sole signatory authority. They also have 3 employees.
Looks like if there's any personal liability going (is that a thing in Austria?) it's mostly/all on him.
Oh, Kristof! You silly thing... On a human level I hope he gets out of this one relatively unscathed, having reimbursed most of the IGG money.
The other 2 shareholders are also listed as co-founders on the IGG funding page. Interesting is that neither Brian Winters nor Paul Schmalzl have Fontus listed on their LinkedIn page (only Retezar still does that on linkedin), which is odd if you are co-founder and shareholder of a revolutionary new device that was supposed to not only help you on your 'adventuring' but quite possibly the earth's fresh water problem.
Furthermore, Brian Winters who is 30% co-owner of Fontus, was an engineer until august 2016 at a company that provides engineering solutions to other companies (sounds like something that Fontus said about them getting engineering support from some outside consulting company in one of their updates?) and lives in or around Orange County in LA. Irvine, LA is right next to Orange County and is where the IGG campaign was listed as based out of. Not a coincidence it seems.
Now why I just listed all that is this: in one of the updated from Retezar, he claimed the prototypes where disappointing and progress was slow (we all suspected that if you ask a company to beat thermodynamics, then you will be disappointed in their work), and subsequently they moved out of the US and went back to Vienna. It seems there was no need anymore to base the operation out of Irvine, likely because their engineering consulting company told them at some point that what Fontus wanted to do was simply not feasible in that small a package. Perhaps this means that things did not end well between some of the major shareholders of Fontus or that the other shareholders after knowing the issues the product development faced,decided to no longer be publicly associated with Fontus on LinkedIn. Unfortunately for them, the funding/Story page on IGG cannot be changed and their association with Fontus will be forever and ever as long as there are archiving sites that show their involvement. Being co-founders and involved in the funding effort might mean they are also on the hook for any liabilities.
Someone said this might have been a situation of in for a penny, in for a pound, and it really seems these guys got in way over their heads. I mean, in their response at this same forum/thread last year they basically told us all that it was just a design project and somehow it got so much media attention and even a Dyson award that they were suprised the sudden exposure and thought: heck maybe we should really put an effort into it now and run with it, start a crowd funding page and do this thing!