Capitalism ends where left begins.
I’m not sure if you’re gatekeeping or just generalizing.
Neither. The left/right divide is Socialism/Capitalism. There are various Overton Windows, ie what is considered left or right when compared to an areas median, like Liberalism being left of the American median despite being a right-wing, Capitalist ideology.
Anarchism, Communism, Marxism, and other forms of Socialism are leftist, while Liberalism, Social Democracy, and fascism are rightist.
Uh. Okay. If you say so. I wasn’t going to say anything about the No True Scotsman fallacy, but you really did force my hand with that last one. That’s outright silly, and a pretty vile attempt to coerce conformity out of of other progressives who don’t align with your perspective on economics by thinking you can label them “right-wing” for it.
How would you propose left/right be divided, if not by the commonly accepted mechanics by which they differ?