I don't think it's that, I think they just want people to onboard onto these things before understanding what the actual cost might be once they're not subsidized by megacorps anymore. Something similar to loss-leading endeavors like Uber and Lyft in the 2010s, I suspect that that showing the actual cost of inference would raise questions about the cost effectiveness of these things for a lot of applications. Internally, Google's data query surface tell you cost in terms of SWE-time (e.g. this query cost 1 SWE hour) since the incentives are different.