Allow multiple categories
I think it would be nice to put my stream under both Art and Makers & Crafting at the same time, since I often do both art and crafting in the same stream, or do crafts that approach art, or do art that qualifies as crafting.
I also see a lot of people playing a game while also playing stream raiders, so being able to designate both stream raiders and the game they are mainly playing would be nice.

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PlatformingPangolin commented
YES. The single-category issue is a continual annoyance for many gamers who stream multiple games in a single stream, which can happen for a multitude of reasons. If I play three games in a single stream, I should be able to tag all three, on the VOD at least. If I'm searching for a particular game, some other streamer deserves to turn up in my search even if they only played it for part of their stream and chose to tag one of the other games they played in that broadcast.
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hamselvdk commented
Please allow this I am 3DPrinting, doing creative modelling and gaming + I like to stream it - but I cannot make a category on the stream to fit this.
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Alcaeus_ commented
Another example of where this could be useful, creating game mods. If you put it under the game category you won't get normal sci & tech traffic. If you put it under sci & tech you won't get the normal traffic for that game.
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Llammissar commented
More to the point, it's common for games to fit in multiple categories, and I've heard streamers say they don't bother to switch from Retro to a more specific category just because no one will see it.
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CptHardluck commented
Many streamers are streaming things that fit into multiple categories. Mainly, podcasts and artists who are discussing or creating art based around specific video games. If you can't trust your community to sus out people who would abuse multiple categories, how can you trust them with a single one?