Well, there are batiks and there are batiks and there are things printed to look like batiks. In my bucket list of things I will probably never be able to do, I'd like to take a cruise and visit the Hoffman Batik factory on one of their limited openings.
Here's a a video that might answer some of your questions:
https://batiks.com/blogs/blog/behind...batiks-factory
There are also the more art style of batiks which can be made assembly line fashion but are more hand/time intensive. There are other wax processes, including African designs and dyes.