Also, in the meantime it was pretty well established that they can't hold you responsible for the actions of others.
"I'm sharing WiFi access with several neighbors. In accordance with privacy laws, I don't retain any router logs because they're not necessary for this. I've reminded them again not to do illegal shit, as I've already done when I set this up. My router does not provide support for filtering traffic, and it would be unreasonable for me to go buy a different one just because of this. Kthxbye."
"I'm sharing WiFi access with several neighbors. In accordance with privacy laws, I don't retain any router logs because they're not necessary for this. I've reminded them again not to do illegal shit, as I've already done when I set this up. My router does not provide support for filtering traffic, and it would be unreasonable for me to go buy a different one just because of this. Kthxbye."