Are you referring to the exhibition layouts done by HunterTube on YouTube? At least a few members here have done Plarail layouts for public exhibition. We also have members who’ve built large, elaborate, semi-permanent layouts at home and post videos on YouTube, which I suppose is a form of virtual public exhibition.
Plarail public exhibits are still a relatively uncommon outside of Eastern Asia but they certainly are out there! My son and I have offered to do one for our local Train Day and I’ve even discussed it with our city’s new head of MPO but sadly, COVID put those plans on indefinite hold.