Yeah, no. Every gamer with a nosy neighbor does not need to be “protected” by people like you telling the landlord they’re going to burn the house down.
Except it was made my business when the landlord asked my opinion on why their house was using so much power, and he told me they had a high end gaming rig, multiple fish tanks, and Air conditioners going.
Nope, what your neighbors do in the privacy of their own home is none of your business even if the landlord asks. I don’t know why that isn’t obvious to you.