It has become apparent to me that who the query costs are billed to (at least when using UI) are dependant on the project selected up top. I.e. if I query a dataset in 'project_a' but have selected 'project_b' at the top this query would be billed to 'project_b'.
(Who pays query costs on datasets across multiple users in BigQuery? and https://cloud.google.com/bigquery/pricing#how_charges_are_billed)
Is there a way to limit this cross-billing occurring without completely removing people from other projects?
I am worried that if somebody forgets to switch their project at the top we could end up billing someone for another clients' work.