I try to avoid street parking downtown now.
I slice through my renewal stickers in the pattern of an X (approximately) with a razor blade or a very sharp knife. You can cut through the registration number at an optimal point of your choosing.
This makes it very difficult to remove the sticker in whole and place on another plate. Plus it forces the thief to take more time and risk being noticed.
I worked for an, “urban” company and there was some guy on a bicycle going from car-to-car in the parking lot. Seemed to be focused on license plates. Security ran him off.
The judge even had a plate where the perp cut off the part of the plate with the sticker.
That became so common in urban parts of MO that the state moved the pace for the sticker to the middle of the plate.