As mentioned elsewhere in this post, a lot of assumptions can be made about female streamers -- particularly any that might be considered attractive. The general consensus among certain groups of (mostly) male streamers is that these girls wouldn't be popular if they weren't using their bodies to attract male viewers.
A popular term used among those that feel negatively about these girls is "thot", an acronym for "that ho over there". It's thrown about often -- and by other streamers and content creators who make some -- or all -- of their living talking about their fellow creators.
Earlier this year, Pewdiepie -- whose seen his own share of scandals the last few years -- drew the ire of Twitch streamer Alinity when he showed a clip of her stream and referred to her as a "thot" in one of his videos. Seeing the video, Alinity addressed it the way all content creators do, by commenting about it live on stream, saying, "Just for that word. I'm going to copy strike him," before telling someone offscreen to do just that.
Following the copyright strike on Pewdiepie, channels reporting on the situation also received copyright strikes from Alinity, who used an agency called CollabDRM to strike any video using clips from her stream. At one point she's reported to have bragged about how much money she pulled in from the copyright strikes. Even prominent YouTuber Philip DeFranco decided to investigate the whole thing, due to the apparent abuse of the copyright claim function.
Of course, there was the obligatory back and forth between Alinity and Pewdiepie before the whole thing was over. Some spectators continued to take issue with Pewdiepie's use of the word "thot", while others -- particularly those in the YouTube community -- voiced concerns over the abuse of the company's less than stellar copyright system.
It's not at all uncommon for companies to make dubious copyright claims, and take in all of the revenue from the videos while the creators work to get the claim removed. When that happens, the content creator is just out that money. So you can see why this would be such a huge issue.
That said, it's easy to see why any streamer would be upset at having such a derogatory term used to describe them. But, it also stands to reason that abusing the YouTube copyright system is not the way to handle it.