The first time definitely is a drag, but I had to do it exactly once a few years ago. If I ever need to publish another library, it's trivial. Bintray isn't standard, which isn't the worst thing in the world but does become aggravating at times.
Re Bintray isn't standard: There is no standard, both Bintray and Maven Central are just internet repositories. JCenter is bigger, so if you define "standard" as "bigger one", Bintray is the way to do.
If by "standard" you meant "default", like Maven Central is the default in Maven, here I have some news for you as well.
Bintray is the default in Mac OS' Homebrew, Android Studio, Groovy's @Grab, and first class citizen in Gradle, Ivy and SBT.
