Bike theft has been going on for as long as there have been bicycles to steal. My first good 10-speed bike was stolen in 1971 when a thief cut the cable locking it to a post. Now with more expensive bikes being used today there is even more incentive for people to steal them.
The only solution is to keep the bikes out of sight, either inside a vehicle or inside a building. Leave a bike outdoors and it will get stolen. If you cannot bring a bike indoors then better to buy a cheap used bike that you can afford to lose. One of the local bike shops is selling old mountain bikes that are in good condition for $250 each. I can buy two of these for less than the cost to insure one of my e-bikes for a year.