Is this true or is it what Googlers who work on the low priority products that will inevitably be killed off after a few years tell themselves to feel better about working on what is essentially shovelware clones of the latest idea someone else is having some success with?
Google are big enough and generate enough profit that they can afford to have entire divisions of developers who are kept around in case they're needed one day. That doesn't make those people good developers though. Obviously there are some very capable people on those teams, but if they're genuinely talented why aren't they working on Search or Ads? That's what makes Google money, so that's why the best people end up, not on little side projects.
Google are big enough and generate enough profit that they can afford to have entire divisions of developers who are kept around in case they're needed one day. That doesn't make those people good developers though. Obviously there are some very capable people on those teams, but if they're genuinely talented why aren't they working on Search or Ads? That's what makes Google money, so that's why the best people end up, not on little side projects.