If you don't mind me asking @j95 – is your usage actually generating costs?
We've been using Metabase with BigQuery for a few months with our team of 8 and so far our usage has stayed under Google's threshold and I'm trying to anticipate (and budget for) the day we exceed the free tier.
Hi @jamesgreenblue. The only reason it was costing us anything was that I had set up our Big Query instance with much higher storage and performance than necessary. I've since downgraded it and the costs are now super low. I think we are charged a few dollars a day at the moment.
In general I think it's fairly easy to keep costs low in a small team/with a small amount of data querying.