A (Custom) Category - Just one singular customisable option
So it'd be one singular category for anything typed in that doesn't line up with another pre-existing stream category/topic that's able to be set. And it'd be whatever is typed but appended with "(*Custom Category)" following whatever they set.
When viewers search for categories they'd have to set it to custom and then type in what they look for. And then the named results would specifically apply to anything under the custom category and only show stuff that's been set to a custom one (with whatever they typed being the thing that's searched for first - within what streamers have set as their own custom category/status)
Commonly used custom terms that are similar can also have suggested/auto-corrected to the most popular/biggest one that's in use. (For the Streamer that is opting to use the 'Customisable' one) with the biggest suggested one overall getting considered to be an official preset category
Adpocalyptic
shared this idea
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Adpocalyptic
commented
That way it wouldn't be an issue for the pre-sets that already exist & are in use. (With the most popular being essentially voted on by viewers to be reviewed by Twitch staff to add as a default option)