Increased captchas, sometimes sites will also break for non-obvious reasons (usually because you need to flip the setting that enables canvas data reading to the left of the URL bar), your time zone will be set to UTC on every website that you visit.

There are a few ways of looking at the captchas; the optimistic lens is to look at it as a response to people who say that it's impossible to meaningfully reduce fingerprinting. If that was true, Google wouldn't be so mad at me for flipping this setting on.

But it does make some browsing more annoying, especially if you're not technically savy enough to realize what's going on when something unexpected happens. I think it's the right decision for them to have it off by default (at least for right now).