Adding internet or WiFi as an amenity will help your listing show up when people search for places with internet provided.
You may consider stating to guests that if they do use your internet provided, they agree to only use it for legal purposes and that they promise to not use it for illegally uploading/downloading files, or other illegal activities.
We encourage hosts to use WiFi safety best practices:
Create an encrypted (ex: WPA2) guest network, and only share that password with guests after they’ve confirmed their booking
Store your router and modem in a secure, locked location in your home that guests don't have access to
Create strong passwords for your router and modem, and change them often
Routinely check your router and modem for software updates