Excuse me, could you possibly shed some light on the custom of tipping in Hong Kong? I've heard conflicting reports about whether it's customary or not, and I'd like to avoid any misunderstandings during my upcoming visit. Do most people typically leave tips in restaurants, taxis, or other service-based industries? Are there any specific guidelines or unspoken rules that visitors should be aware of? I'd appreciate any insights you might have on this matter.