For example, in the downtown areas of Canada's densest cities, before smartphones, about 90-95% of random strangers coming up to me wanted money, either as beggars or seeking donations for some "charity". The other 5-10% would generally be asking for directions or the time. Even those interactions could have always just been a ruse to see if I have a watch worth stealing, or as a distraction to help enable pickpocketing.
Since smartphones became widespread and nearly everybody has access to the time and directions on their own, pretty much 100% of the time I've been approached by strangers in public is because they want me to give them money. One person mistook me for somebody they knew.
It's just not worth me spending any time responding to random strangers because it's almost guaranteed they just want money.