Just spreading this info around the internet, please don't mind that this of all things is my first post on here!
YouTube has hastily hidden all the menus, but it's still possible to get community captions to work, for now. Obtuse, but possible. The contributor and video uploader need to access the editor URL directly, click here for a tutorial.
Again, it works, for now.
On 7/31/2020 at 4:29 PM, ekket said:The privilege of having community subtitles* appears to cost the creator $12 per month.
* freely available for 12 months, to eligible channels
A more long term solution is likely the http://youtubexternalcc.netlify.app/ project, which aims to host captions externally for free. Downside is that they don't automatically show up on YouTube, but neither do Amara's captions, requiring the uploader to add the files themselves.
As it so happens, I am compiling a more thorough list of resources called the "YouTube Captioner's Toolkit" where you can find out more. Spread the word!