What's the alternative?

The people and companies opposing green initiatives have entrenched industries and money. They have been waging media and lobbying campaigns for decades. If it takes some people pushing their green agenda for profit in order to save the planet, so be it. At least their businesses are moving us in the right direction and not holding us back.

Author is green anarchist. I think it fair for her to criticize Greta Thunberg if he thinks that green capitalism[1] can't work.

But using the word 'using' is unfair. If Greta Thunberg would be green anarchist, it would be the other anarchists using her no doubt. To work with others is to be used and use others.