I absolutely agree that they should be criticized for it, or at least explain their deal with Bing. If one can trust Google not to create ad profiles from Google Analytics data, one can also trust Bing to not use ecosia data to build user profiles. But for that to be a trust decision, we'd need to know whether they actually have any such deal with Bing.
It’s disingenuous and misleading to the average user. They should be criticized for it.