[CodesInChaos]

Was it? Assuming an M40 cluster consists of 3 m6g.xlarge machines, that's $0.46/hr on-demand compared to Atlas's $1.04/hr for the compute. Savings plans or reserved instances reduce that cost further.

[computerfan494]

There's definitely MongoDB markup, but a full 33% of their bill was AWS networking costs that have nothing to do with Atlas.