Yes. Not much, but more than I got - nobody invited me to anything when I was going to about 1 meetup a week for a couple of years, except for suggesting other related meetups.
Turns out people at meetups often have very full lives already, and many are there for the business networking opportunities, not to develop an outside-of-work social life.
So there were LinkedIn connections made, and some transactional relationships. I did occasionally meet some people later one-on-one. (I shouldn't have said they didn't lead to further interactions; I'd forgotten these few). Good and interesting people. But they're not what I'd call friendships. Perhaps the seeds of one, if they went on for years.
To be fair, I wasn't looking for more social life either. I merely observe that friendships did not flow naturally from going to meetups, the way you seem to be suggesting happens readily.
On the other hand, a chat with someone random at a library in the same time frame did lead to friendship. As have many other life events.
What I'm suggesting here is that meetups are a great way to find people interested in similar things, but at least in my experience, I don't recommend them as a way to find friends if that's what you're looking for.