Ways not to lock your bike

Literally isn't. Place I go regularly has a lot of theft from us stands, they'd lost their last bike, so then got a new e bike. And a fagrabboiughit (yup). Locking only the seatpost.
Pointed it out to them,they literally didn't understand how it wasn't locked.
So politely moved it around in such a way to make it look more locked than it was. Then went to office securities desk and borrowed a spare company lock, put that in it and a very subtle note.

Few weeks later, same again, put rhe spare lock on it and a separate note.
Yesterday went and again wasn't locked. So just left it, can't fix stupid apparently! Few of my mates had also told them it was a very good lock but they weren't using it right.
Today...... "my new ebike has been stolen, oh noes...."

Like, literally what can you even do