Your view should be biased by the rejection. "Apply again in a year" is their standard rejection script. Google has so many candidates applying that they can

Your view should be biased by the rejection. "Apply again in a year" is their standard rejection script. Google has so many candidates applying that they can act like the attractive woman who has 100 people asking for her number every day. Google will look for the slightest excuse to reject someone. You might as well interview and see what happens. However, I would be reluctant to waste a vacation day on an interview if I already have a job. Another possibility is to get hired at Google, wait 1-3 years, then try to transfer to something better. The most likely outcome is that you will go on the interview and it will go nowhere. Google has a bad reputation among candidates who interviewed and didn't wind up working there. It's for a good reason.