[eythian]

I've been on the other side of that (not google), taking people to lunch who are interviewing. Usually you're picked because they're from the same country as you or something like that. At least where I work it's not like those messages. Instead it's lunch because food is good to have, and if you were lunching with them you weren't involved in the interview process at all, and it gave them a person to ask questions of and get an unbiased-as-reasonable response. If there were real red flags I'd probably raise it, but otherwise I had no contact with anyone in the hiring process regarding that person at all.

[neilv]

I don't know what percentage of companies use the lunch in an on-site interview for evaluation, but definitely some do. Either with express feedback into the process, or because it's the hiring manager taking the person to lunch, and this is shaping their opinion.

I suppose some could also use it as a refresher break, from their battery of antagonistic one-way LeetCode hazings, or a chance to give the person a more comfortable feeling about the company (not otherwise permitted by their hazing process).