When you visit the Google’s chatbot bard’s website in Microsoft Bing. A New Button pops up besides the search bar which lets you compare bard results with Bing chat’s. I have no idea why they implemented this, well maybe to show off the their chatbot is better than bard or something?
No, they operate their own crawlers.
Per https://duckduckgo.com/duckduckgo-help-pages/results/sources/:
Oh interesting. I’ve seen their crawlers in my server logs, didn’t know they were using it to augment Bing.