Does anarcho-syndicalism inevitably lead to collaborating with the bourgeoisie, and the government? I personally don't think so.
The same applies to Bolshevism. We are discussing how parties/groups agitate, lead, organise and persuade the working class: not what their actions were after 4 years of civil war, economic ruin, decomposition of the working class, a hostile peasantry, mistakes by the leadership, fusion of party-state etc etc...
Of course not. But we are discussing how workers become revolutionary, not what parties do once in power.