[Indirect relation with crypto] At first, I did not think anything of it, but it struck me today: authorities hate cash and they will do anything to keep track of you. I would not be surprised if in 10-15 years, ANYONE carrying more than, say, $1000 will need to provide justification on demand. Food for thought - just a trend I am sharing. In any instance, that will be another great use case for crypto (carrying as much currency as one wants).
Example (sorry page is in French): https://www.lapresse.ca/actualites/justice-et-affaires-criminelles/affaires-criminelles/201902/12/01-5214384-blanchiment-dargent-un-reseau-sophistique-demantele-a-toronto.php
Of course the guy was nabbed for money laundering, but I have seen the same 'only pocket cash' condition being imposed 3-4 times since last summer.