Google’s data part of it is completely optional (it is only if you enable Google’s index, which is currently in the beta phase and only available in select regions), and Microsoft’s data part is “In order to provide non-personalized Microsoft Bing results and ads, we are contractually obliged to implement Microsoft Clarity to capture how you use and interact with our website through behavioral metrics, as well as sharing your IP address and search terms. This behavioral data is captured in individual search sessions and is not tied to a user profile unless you consent.” I’m pretty sure Duckduckgo has something similar with Microsoft too (could be wrong, just thought I remembered reading something about it). Using Searx or some other heavily-privacy focused search engine would probably give you somewhat better privacy, but I personally find Ecosia’s privacy good enough since they do seem to put forth as much effort as possible given their contract and their privacy policy isn’t bad (it’s way better than Google’s). They also plant trees/environmental conservation with the money and are a nonprofit, which are both things important to me.

If you don’t feel comfortable using Ecosia that’s fine, but in my opinion the privacy policy isn’t too bad, most other engines have similar policies (or worse), and they try to do the right thing with what you give them