Not sure why this is getting backlash. Just look at https://fund.blender.org. Other corporate sponsors are Google, Meta, Nvidia, Netflix, even Adidas.
This just means more support for a major OSS project.
A lot of those companies likely sponsor it because they use it themselves, and actively benefit from its continued development. The incentives are at least somewhat aligned.
I doubt Anthropic has much use for such a tool internally. They're sponsoring it because they want to inject their slop into it and replace the people who do use it.
Blender didn't have support from big tech for decades and has flourished. It's now on par with top of the line proprietary 3d software.
The upside is meaningless compared to what's at risk when for-profit grows influence.
Because Blender is a tool for making art and Anthropic makes tools for stealing art