This seems to be quite a recent development. duckduckgo has Bill & Melinda Gates Foundation in the title. Google and the title tag on the website do not.

As for the value of Bill Gates as a husband or of his foundation, the positives don't outweigh the negatives. I have no problem saying with certainty that this is a bad move on Anthropic's part, because anything that Gates Foundation does could be done under an untarnished name.