I've seen those signs before. They were posted in rapidly gentrifying Hispanic areas, probably targeting those with weak English or financial literacy.
The interesting things is that the signs appeared to be handwritten with a black marker but all of them looked exactly the same. There were commercially produced but they took the effort to hide it.
The jankiness is intentional. Apparently it helps weed out people that'd catch on to the scam. Someone dumb or desperate enough to call a hand-written sign is more likely to follow through to the end without getting suspicious. It's the same reason lots of spam and email scams are full of typos and bad grammar.
The interesting things is that the signs appeared to be handwritten with a black marker but all of them looked exactly the same. There were commercially produced but they took the effort to hide it.