Rallying people to do what? Boycotts? They have some effect, but never enough. The most influential YouTuber I can think of is Louis Rossmann, and you know, he's not a YouTuber, he's a MacBook repair guy who took up YouTube.
The influencial youtubers I think of actually can shape political debate and thus policy - what they say, if it gains enough popularity, sometimes seeps into the political agenda of the ruling party (which is always looking to "score points" with the voters and has its ears to the ground listening which issues and points people are currently responding to). It's basically like being a columnist of an influential newspaper, except you don't need to have the right connections to become one.
No, not boycotts.
The influencial youtubers I think of actually can shape political debate and thus policy - what they say, if it gains enough popularity, sometimes seeps into the political agenda of the ruling party (which is always looking to "score points" with the voters and has its ears to the ground listening which issues and points people are currently responding to). It's basically like being a columnist of an influential newspaper, except you don't need to have the right connections to become one.