It’s not even that (and I think you mean are not).

It’s because they are dealing with literally hundreds of resumes. They want to be lazy and just slap on their logo and be done.

PDFs just make this much harder than they want to put in.

Had Javascript on my resume, and the recruiter send me to an interview for a Java programming job…

The other one asked me to take an online test about cryptography algorithms in node js for a prescreening interview, which is something I never even remotely had to deal with in more than 20 years working for multiple e-commerce, health systems, CMS and other services and websites. Also, no Google or any online sources allowed to solve their questions…