https://www.theregister.co.uk/2019/10/07/mongodb_eliot_horowitz/

Interview A year after its controversial switch to the Server Side Public License (SSPL), and with new products livening up the Summer, MongoDB remains unrepentant.

The change was aimed at making vendors selling a service using the company's code share the source of applications used to run the service as well as any tweaks. The move appeared to be aimed squarely at cloud vendors, content to "capture all the value and give nothing back to the community," as Dev Ittycheria, CEO of MongoDB, told us at the time.