I have an alternate explanation. With the rise of AI recruiters, there is no cost to them to contact you. They don't even have to do the search and compose the message. They're basically reaching out to everyone.

At first I found the AI recruiters impressive, because they tricked me. I thought the recruiter had really done their homework and read my profile deeply!

Now I know that an AI is reading it, picking random things to highlight, and then composing a message. But they're not real. They're just trying to connect to you so that they can say you are in their network when they go to sell their services to hiring managers.