There are a few things to consider if you are in the investment space:

- Growth rate: you can't compare them to the average single digit growth companies or dividend focused companies. Most of these tech companies revenue are still growing at double digit with good moat. Pe is a good measure but it's not absolute. If you believe they sustain their growth then it's a good bet. And you can choose not to buy in their growth stories too. At the end of the day investment is about judgement call

- History benchmark: some of their pe is at historical low. So they are actually cheaper than before.

- Pe ttm and forward pe: how much pe ttm are they at? how much forward pe are they projecting? If forward pe is significantly lower, that means the current analysts consensus is that they will grow in future

- Pe is the a number but it's not everything. You need to consider multiple things to decide if that's undervalued for you. It's highly subjective as different interpretations are common.

- This post is about if you want to play the gaap game with private tech companies. My point is that there are still many public companies that are cheap at certain point. You just need to be patient and be willing to research and wait. For example, meta at around 500 was a buy for me, but since then it has rebounded it's still good but not as undervalued as a few days ago