Entropy is ever expanding, so there’s no way to do no harm, though ideally we each try to do as little as possible. There are some parts of our lives where there’s no perfect answer, like technology or clothing, because for the most part, those are both generally exploitative and necessary to support yourself. In these cases, buying second hand can help, but it’s still a secondary market for products that benefit from slavery and/or it’s a separate, new evil like Goodwill or the Salvation Army. Taxes are also necessary, and the only workable remedies for the awful things that are paid for by those taxes are petitioning and electing as representative a government as possible or bringing it all down (which would itself include quite a lot of violence).

This is a totally different thing. This is investing excess money into an evil thing so that you can profit. There’s no requirement here, it’s an entirely voluntary worsening of the world.