Is it against Google's policies?
It sits in a grey area. Google's Developer Distribution Agreement ties an account to one verified owner and restricts sharing or transferring account access. Publishing through someone else's account does not get an app removed by itself, but the listing legally lives under their verified identity, and Google can act on the account if its policies are broken.
Own a Google Play developer account?
ConsoleMint is an app monetization company: it builds Android apps, publishes them, maintains them and monetizes them with in-app advertising, then shares the ad revenue with the publishing partner whose Google Play account distributes them. Developer-role access only — never owner access, never a password — revocable with 30 days notice.
See how ConsoleMint works →A fixed monthly payout while the apps ramp up, then a share of the ad revenue.