Chase chooses this type of category for their benefit, not ours. Many streaming subscriptions are automatically billed monthly. Chase knows that some people will forget to update the card on file with the streaming service after the quarter ends.
Oh, I'm aware the psychological aspect of many 5% categories—same reason why Discover will do a streaming quarter or they have things like Amazon and gym memberships—change it over and forget!
Streaming seems the most blatant as it's generally <$50 month for most and is a move to get someone to switch recurring subscriptions.
(And I agree on Chase categories being for Chase's benefit...if they created categories for our benefit, there'd be a permanent grocery category, but then again it gives YouTubers an excuse to complain)