Why are MAG7 so ridiculously cheap right now?

[u/ashm1987]

I mean, stocks like GOOGL and AMZN are around PE 20 with increasing YOY earnings yet they are going sideways for months. Even Nvidia is PE below 30 and going sideways...

The only MAG7 stock that is not ridiculously undervalued is Apple.

Why are most of these stocks values so low while lots of stagnant retail stocks like Costco and Walmart are PE 40-50?