I've been stomping on the stock pedals of my Zizzo Liberté for 5+ years now without issue. I don't fold them often these days, so there's been no wear from that, but I do stand often on the small hills and rises in town and stand on them on dirt trails that I ride from time to time

I have noticed some flex if my foot is placed further from the crank arm so I take care to position my foot closer and more over the part of the pedal that doesn't fold.