I'm in my 50s and when I was early 20s I crossed from US to Canada for a business meeting. "Why are you coming to Canada?" "To work." "Where's your work permit?" "Huh, I don't have one." That simple "wrong word" slip STILL gets me flagged and cordoned off into hours-long border diversions whenever I go to Canada.
Just imagine how it'll be now... for decades you'll be fending off some hidden receipts from an IG comment you made.
Had a similar experience: over a decade ago our firm opened an office in Canada and being scrappy and startup-like I had to cross into Canada with some networking equipment to help set up the new office. The amount of scrutiny was insane: thankfully it never stuck and I was eventually let on to do the work and return
Back in around 2012 or so, some friends and I decided to book a canal house in Amsterdam to all pitch in together and live there for about 2 months. Celebrating a few coinciding life achievements before moving onto the next phase of adult life sort of thing.
I worked remotely, so planned to simply do work for half the time I was there. As such, I brought a proper monitor, keyboard, etc. with me.
As I have my 20" boxed up LCD panel in my arms in the immigration/customs line at Schipol, a Dutch immigration officer comes up and asks me what the monitor is for. I of course like an idiot said "staying here for a couple months for a vacation, but I plan to work some while I'm here!". I got infinitely lucky with the officer in question - she very quickly told me I was incorrect and that the monitor was to play video games and that's what I was going to tell the immigration officer at the passport desk.
One of those early lessons learned that I'm sure looking young, naive, and stupid helped me in a way that I could not get away with in my mid-40's these days.