I think that in the context of global climate change, the concern about wasteful billionaire emissions is misplaced.
The people who need to set an example are those of us who celebrated school strike for climate. Millions of middle-class families in developed countries, all making a real sacrifice of their consumption, their lifestyle, would set the kind of example the rest of the world needs to see. Paul Allen making a show of Going Ascetic won't make a dent in global emissions. Millions of Americans and millions of Europeans making a show of giving up cars, giving up travel, giving up high-speed internet and cheap drop-shipped goods, giving up 90% of the middle-class luxuries we all take for granted, would make a dent and send a message. It would also beggar Paul Allen.