I have an answer:
Squatters are actively and deliberately obstructing someone else from using something they legally own or have rights to (a pub, for example) whereas those unfortunate enough to have to "sleep rough" are not. It's a pretty clear …
Ride an old bike (as suggested) and always park it next to (a) a nicer looking bike and/or (b) one with an inferior lock. Twenty three years on, I still have my bike.
My landlord recently had some exterior painting (windows, porch) done by a local chap Mr Cornish and his brother, and I'd say the end result looks good, and they were tidy and efficient in the process. Though since I wasn't paying, I've got no idea…