Why when I create new project or addon I get an error from bintray. I thought bintray was dead

Seems like a long standing problem in Gradle:

I have no idea why it happened now and didn’t show up in earlier versions.

Try to use the suggested approach with adding pluginManagement section to settings.gradle, for example:

pluginManagement {
    repositories {
        mavenCentral()
        gradlePluginPortal()
    }
}

rootProject.name = 'onboarding'