I'm of the opinion that if they accidentally leak their credentials to anyone, they might as well leak them to everyone.

Sure, the risk of compromise goes up, but the whole culture of "we only sent those passwords once on unencrypted ftp across the internet" leads to powerful nation state spies having a field day...

If all unencrypted data sent over the internet were in a big public archive for everyone to see, then people would soon clean up their security habits.

In the intro text it specifically says:

No legitimate services are offered on the addresses receiving these attempts, so there is no chance of a real user accidently submitting their credentials. (Yes things other than SSH occasionally show up)

The odds of that are slim to none.