Every food commercial, advertisement, and packaging in the US is currently protein obsessed. I just bought 3 burritos, and the most noticeable thing on the entire package is its protein content. TV commercials about waffles are advertising that they have X amount of protein per serving. The products in my jobsite's vending machine have protein all over every package.
I'm sure some people are chugging eggs for protein but it isn't the norm and that is not at all what led to eggs being more expensive in the US. It was bird flu outbreaks combined with new regulations in some states coming into effect. In my state everything now has to be "cage free" which came into effect right around the whole egg price spike, but from what I can tell the price spike was mostly due to bird flu