But you have no idea that you wouldn't be able to continue with your 40hrs and some days remote if you had a job at Google. There are lots of people who have a positive work/life balance at Google. Some take advantage of some perks, some others, and some don't use very many at all, but the fact is that there are many perks available catering to a huge spectrum of desires, whether that means fitness, food, social, cultural, technology, or financial.

Just because Google offers onsite laundry and serves three meals a day doesn't mean employees have to participate. But having them makes it a more appealing place to a broader range of potential candidates, and a friendlier place for employees, too.

Do people who work 40 hours a week get promoted?

Working long hours has zero to do with getting promoted.

I don't think that they want you to stay there for a long time, because they serve only cold food in the evening (Zurich office). It is also OK to work from home from time to time (has to be agreed with manager).