Moldova as a country has one of the lowest per capita GDPs in all Europe - usually indicates passengers originating in Chisinau will be price sensitive. While I went to Moldova as a tourist and enjoyed it, I do not expect there will be much inbound tourism.
An E190 has rather fewer seats compared to an A319 or B737 - making Gatwick's airport fees much more painful per passenger compared to Easyjet or Ryanair.
FRatSTN - don't hold your hopes up too much about airlines willingly switching from Gatwick to Stansted - I suspect this is simply a case of an airline being squeezed out of Gatwick by economic factors and needing to find a new airport in London