Raku isnt falling from public favor, it hasn't made it yet. It's an entirely different language to Perl 5. Like the difference between C and C# or Java.
Yea, sorry I'm not super familiar with the project, but that is the general vibe I get about Perl.
Interestingly enough 落(raku) also has the connotation of failure or missing the target, so not very auspicious in the context of a new language either!