I think Google doesn’t care about that at all.

They most likely pay peanuts compared to you for “bandwidth” (which for them is more of an electricity cost and trough-output allocation than a specific numeric value like consumers and smaller companies have). You also cache the video on your own device making the multiple tab thing useless if you don’t know what you’re doing. And Google can also just block you when they attack their servers, move traffic around, and so much more advanced stuff that protects their infrastructure.

tl;dr: Trying to boycott Google by trying to waste their resources is useless.