Horrible. Now that the property is more valuable due to the upgrades the landlord knows they can charges a higher rent for it. The real mildly infuriating part is the fact that we as a society reward this behaviour. Sociopathic behaviour is actively encouraged under capitalism.
Not even close to a sane take. If you look at the text exchange is clear it was done without the owner knowing. As an owner the renter could have cut all sorts of corners… you’d have to tear it all up just to even make sure its water sealed properly just so that your house doesn’t rot the through because some rando renter made choices about your property. If your going to drop 12k on a reno of a bathroom… drop it on a down payment instead.
12k is upgrades is both enough to potentially have the landlord owe additional taxes if they are assessed and not enough to be able to increase amenities enough to meaningfully raise rent.
The real issue here though is that you don’t go altering someone’s property without their consent. I don’t know how that isn’t the obvious answer here. The amount spent doesn’t even really matter (although I’d argue more spent is even worse, considering it implies greater alterations without consent).
Landlords can be and very often are terrible. But on a base level if I own a piece of property for which I am ultimately responsible, I see no justification for being ok with someone else making thousands of dollars of changes to that property without getting my ok first. It seems incredibly basic that I as owner should have a say in it.