I don't think that most of them are from big-name companies. I run a personal web site that has been periodically overwhelmed by scrapers, prompting me to update my robots.txt with more disallows.

The only big AI company I recognized by name was OpenAI's GPTBot. Most of them are from small companies that I'm only hearing of for the first time when I look at their user agents in the Apache logs. Probably the shadiest organizations aren't even identifying their requests with a unique user agent.

As for why a lot of dumb bots are interested in my web pages now, when they're already available through Common Crawl, I don't know.