I agree.
In my opinion, this is again a bit of an overreach. It’s changing a setting on a users PC that they typically would not expect an Office product to set, in a different third party’s software. This used to happen a lot in the past with third-party tools changing browser defaults to generate revenue, it was called Browser Hijacking.
Microsoft might be doing this because they think it will give the user a better experience but doing it by default without even asking the user or the organisation is too much. I’m pretty sure Google won’t be too pleased with this either.
It’s not that it’s a terrible feature, it’s about the user and organisational choice. This should be an opt-in, not an opt-out.
My thoughts if anyone is interested: https://tomtalks.blog/2020/01/office-365-proplus-will-browser-hijack-google-chrome-to-use-microsoft-search-bing-search/