Perhaps it’s nitpicky, but I’m puzzled why everybody (not just here, but internet-wide) is referring to these appearances as “cameos.”
A cameo, as I’ve always understood it, is a very brief appearance of a well-known figure, like the way Alfred Hitchcock would frequently appear briefly in his own films, or Stan Lee would show up to say a couple of lines in the Marvel movies.
These were full-on acting roles, albeit played by well-known performers.