Chromium being open source actually means jack shit. It's controlled by Google, one singular entity whose only desire is to maximise their iron grip on the internet to squeeze as much ad revenue as they can.

This isn't hyperbole, look at the recent WEI stuff or manifest v3 crap. Time and again, these corporations have showed that they just don't give a shit about the free and open internet.

Which leads to the first point, (Microsoft does seem to be moving pretty heavily into advertising though with all the bs in windows 11), you absolutely can not in good conscience use a big tech product with the argument that they're not an ad company. It's not just the ads which is the issue here. And the problem is sooner or later they'll realise they've a trove of monetisable data, so might as well do something with it. And then we'll have no choice because there will be no free and open alternatives left