What makes you think that they are not scraping Lemmy too? The only reason they might not be is probably how niche Lemmy and the fediverse are, but I am sure there have been people already doing it.
Fediverse is designed to do exactly that. It's free flow of information which is a good thing. Don't let corporations hijack this beautiful concept. We all want information to be free.
I’m not mad about the scraping. The linkedin scraping case pretty much cemented that there was nothing that could be done to stop it. I’m just mad that I can no longer use the app of my choice. No such problem with Lemmy.
I'm sure they are, but Reddit probably provides these companies with lots of personalized metadata they collect just for them which they may not get from Lemmy.