If you scroll to the bottom of https://raku.org/ there is a list of a few companies that are successfully using it in production.

There are also some blogs here https://planet.raku.org/

It’s definitely not a popular language but it has some users.

Check out https://rakudoweekly.blog/blog-feed/

this is a good intro to unicode https://dev.to/bbkr/unicode-vs-utf-4g8c (it uses raku for many of the examples due to raku's unicode capabilities)

I don't think so. Perl is still used at many companies but Raku is basically dead.

To give you an idea the conference is expected to have 100 attendees.