The fight between YouTube and Twitch just got a little uglier. Producers like Linus Tech Tips, Surny and Aztrosizt have complained that YouTube abruptly (though temporarily) terminated their accounts for using videos to promote their Twitch streams, such as LTT's The WAN Show. It's not that the videos weren't violating rules (the site has long forbidden videos that primarily "drive people off of YouTube"). Rather, it's that YouTube is only now enforcing the rules for videos promoting Twitch streams, and that it's being unusually aggressive -- it immediately terminated accounts instead of issuing strikes. This is oddly harsh when the company has been softer on channels that have done much worse, such as pushing false conspiracies that could lead to harassment and threats.
Source: Linus Tech Tips (Twitter), Surny (Twitter)