Another Many-to-many example within this usecase would be “subscriptions”. Users can subscribe to multiple channels and channels can have multiple users subscribed to them. You would use another relational table that stores the channel_id & user_id, with uniqueness for both together, since “being subscribed to one specific channel multiple times” doesn’t make sense and perhaps put a column to store “hitting the bell” in there too.
The Dutch student loan program is gonna be in a lot of trouble… (Dienst Uitvoering Onderwijs)