boring info,
the paint the builders used was not crap,
it is necessary as your house was a new build,
it will come off the walls if wiped,
it is trade paint, breatheable paint,
a new build contains loads of water, mostly from the freshly plastered walls and ceilings,
it takes time for it to dry out and shrink to normal,
you will be more than ok decorating now,
we say to our cumsomers not to wallpaper or decorate for at least 12 months,
lol at my boring info, late night post