It seems fair enough. It won't prevent anyone from accessing the actual content and it probably makes it easy to justify paying something to MDN to employers.
In practice, if you are not paying:
- Bookmarks can most certainly easily replace the Collections feature
- you can clone the MDN repository for having the documents offline
- notifications could be computed from the commit log
and the subscription probably makes these features more convenient, at least for the notifications and the offline without actually removing rights from anybody.
Seems clever.
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