I'm not setting any line here. I'm saying that we could worry about the big problem first without immediately deciding where any "line" needs to be drawn. I'm saying it doesn't matter which side of the "line" Facebook falls on because we could start with the biggest problems first, then circle back to Facebook when it's top of the list (not a whopping log_10 of at least 2 (!) difference from the current worst offenders, such as BTC).
I don't get why anglophones are so obsessed with these "drawing lines" and "moving posts", particularly on recent years. What lines are these exactly? What posts? This is very bad heuristics, actually.
It seems like you implicitly draw the 'fair' line between FB and BTC.
BTC's market cap is roughly equal to Facebooks. If a POW coin used facebook levels of energy at the same value, would you find that acceptable?