If I get all the benefits of Chrome without weird Google ID stuff (and without having to download and/or build my own Chromium), then I'd use it. Might forget to switch the search engine to Google from Bing. Now they're making ad money.

Regardless, if you want to take the browser market seriously, you need to be cross-platform. Especially if all the hard work of cross-platformness has already been done for you (as is probably the case with Chrome).

Traffic, ad views, analytics and $$$.