Yep, this is exactly what happened with me.
Good luck with the job interview.
If that is what this is.
I wonder what else Google needs to know about you before they offer you the job quiz. I'll bet they've got a big profile already collected on everyone who gets it.
Well, it's a fun game, at the very least.
Funny, to me, that they'd trigger on that particular account, rather than the one I've been using since gmail was nascent (with a considerably larger search history, which would include all the geeky things I've sought over the decade or more).
It turns out the Google Now launcher depends on the Google app, so the home screen just went dead. I rebooted the phone and it got stuck on the splash screen. So it seems Google doesn't want you not Googling. You must Google.
Turns out the other background apps had still started. So I went to the Google Play website on my computer and told it to install a launcher on my phone. A few minutes later the phone sprung to life again. Nice.
By the way, I've been searching with DuckDuckGo for about a month now. Unlike my previous experiments with DDG, this time I haven't given up on it after finding the search results unusable. It's gotten a lot better, and is now a perfectly good replacement for Google Search.
It uses Bing as a backend, just stripping the tracking. (If I remember correctly)
Search results are blended from a lot of different sources. Bing is one of them.