My $200 rusty ebike has been parked outside for 18 months in central London without problems. I take the battery in. The homeless junkie would have to get an angle grinder to cut two D locks, figure out how to buy the battery which costs $300 and is only available from decathlon, somehow try to make a profit out of the whole operation which I don't think I could myself and so on.

It's actually cost me about another $500 in maintenance getting the various bits that pack up replaced but it's a good theft deterrent.