It used to be mandatory to crop the ears for show. It is no longer necessary as they've now changed the rules.
Cropping would seem to be very painful - about 48 stitches in each ear and an endless amount of work - changing bandages, etc. They are not happy puppies - it hurts!
Sometimes the cropping doesn't work: one ear will stand up and the other ear will flop over, or stick out at a weird angle. The operation is expensive to begin with - are you now going to try again?
In Canada, though it's still allowed by law, it is not popular. Many vets will actually refuse to do it.
My first boxer (many years ago) was a "rescue" - ex-show dog that had cropped ears. I thought he was just beautiful - and the ones with upcropped ears "looked funny". All the rescues I've had since then have had uncropped ears - and now the uncropped ears look "just beautiful"; and the ones with cropped ears look so unusual - like "What were the owners thinking? Why would they do this to their pet?" I can't see that cropping the ears serves any useful purpose whatsoever - it's an unnecessary major operation, inflicting pain, creating work, causing trouble if it doesn't turn out properly, and costing mega bucks. It wouldn't bother me in the least if it became illegal.