MOV does not play reliably on Windows, Android, smart TVs or in many upload forms. VTT is what web video players and browsers display natively. MOV is at home in recording and editing on Apple devices; VTT is the usual choice for captions on web pages and in HTML video players.
One MOV can produce several VTT files; when it does, they are offered together as a ZIP download. This is demanding work for a browser: a long or high-resolution file can take several minutes, and your device does all of it, so keep the tab open.
This pair uses the compatibility engine, ffmpeg built for the browser, because VTT cannot be written by the browser's built-in codecs. It is a one-off download of about 10 MB that the browser keeps, it is slower than the built-in codecs, and it takes files up to 1 GB. Only text subtitle tracks stored inside the video are extracted, one VTT file per track (several tracks come as a ZIP); picture-based tracks from DVDs and Blu-rays are refused because they would need text recognition. A feature-length file is fine, since the video is only read and the result is a few kilobytes.