I didn't like the poswallet from the beginning, hence I didn't even bothered to open an account on their site... The first red flag was rised by the (almost) complete lack of company info. I admit the bias of a previous unpleasant experience with staisybit, but at least there were a couple of RL identifiable guys that could pull a few strings around the staisybit's dev/operator (and thanks to them for that!).
All in all, you better get an inexpensive piece of hardware like a Raspberry/Banana Pi or a Pine64, a 16GB SDcard (class 6 would be just fine and less costly than a cheap class 10), install ROKOS and stake like a champ. For those in Microsoft's leash, a second-hand laptop under $150 would be much better...
I wish that poswallet will prove me wrong, but I doubt it. In the long term, greed overcomes even the best of intentions, more so when no enforceable contract is involved.