Don't you have to agree to a strike (or agree to be part of an organization that strikes) to be considered to be "breaking the strike"? Wasn't it taxi unions or collectives that decided to strike? Aren't Uber drivers (and Uber the corporation) not beholden in any way to the organizations which chose to strike? When the writer's guild decided to strike in 2007, that only applied to members of the WGA, not everyone who happened to do any work in that industry or a similar industry. Were bus drivers "breaking the strike"? How about pilots? Train engineers? Surely the fact that taxi organizations decided to strike doesn't mean that anyone involved in human transportation at the time was "breaking the strike."