Overvalued by people who don't know what they were valuing
We had the dotcom bubble. This is the AI and ML bubble.
Remember the words of Scott McNealy about the madness surrounding Sun's market valuation at peak. This is a partial quote, you can search for the rest: "At 10 times revenues, to give you a 10-year payback, I have to pay you 100% of revenues for 10 straight years in dividends. That assumes I can get that by my shareholders. That assumes I have zero cost of goods sold, which is very hard for a computer company. That assumes zero expenses, which is really hard with 39,000 employees..."
A quick way to grab some lucre these days is to put the letters AI or ML on something. Somebody gullible out there will buy it. That doesn't mean that all AI and ML things are essentially worthless snake oil, but a lot of things simply do not measure up.