Anarchism is anti-state. That's it. Everything else is anarcho-something.
Anti-involuntary hierarchy, not those who voluntarily take part of certain types of power hierarchies.
Because I strongly doubt any political change will get everyone to work for 'common interests', and a fair few product creators, service owners, artists and others will try and sell their work anyway.
How do anarchists plan to avoid this? What about the people who don't want to own the means of production and are perfectly fine with working for others for a wage? What would stop people competing with each other to get more money and resources?
Of which we already have a great example in FOSS.
When did anarcho-capitalists stop being anarchists?
It works the same way with anarchism as it does in general; that is to say, it captures a real and major axis of variation among anarchists but not the only one. It actually works a little better with anarchists then it doesin general, because “anarchism” limits one of the other significant axes of political variation that exist in the wider society.
You might say that anarchism is the left wing on a spectrum where authoritarianism or absolute monarchs are considered the right wing. Anarchism is anti discrimination (pro egalitarianism) and by definition is against racism, sexism, nationalism, fascism, etc. It's not because it's "left" like socialists or (socialist) progressives are, but because of the hierarchies it is ideologically opposed to. Its main objective is a society free from imposed and unnatural hierarchies.
Edit: what I'm trying to say is that no one-dimensional linear scale that goes from left to right on which you can place all ideologies and compare them.