From this page https://docs.atlas.mongodb.com/bi-connection/ it appeared that the BI Connector for Atlas was available if I had an M10 or larger cluster. So I upgraded to an M10 cluster to get the BI connector only to discover that if I enable the BI connector, it charges me additional costs. I could not find these additional BI connector prices detailed anywhere on the MongoDB website except for in my account after I upgraded to the M10 cluster. And even these pricing details are not clear:
What is sustained monthly usage? When does the $1.47 rate apply vs the $3.84 rate?