WTF is "Open Source Core"

I recently came across this term and it sounds cool and practical to me.
Thought of sharing it here, as i suddenly realized i have this in my screen all over...

Example : Look at https://www.influxdata.com/products/ , formerly influx DB.

They have real good products (influxcloud, influxEnterprise, TICK stack), inturn all of these are just one "A Real-Time Monitoring Solution"

In data center we host tons of application and we need a true solution for monitoring, there are tons of monitoring solutions datadog, new relic, etc... but all are closed products.

The power of "Open Source Core" is the whole complex product is open sourced ( githubbed )
, but the niche feature to take it to enterprise or integrate will be the monetizing way.

That is , in this example Influx Enterprise is the Monetizing product.

Another example : Hashicorp
https://www.hashicorp.com/

Famously called "Hashi-stack", open sourced all their core complex products.
Vagrant, Packer, Vault, Consul, Terraform. But their enterprise version and another niche product atlas is their monetizing product.

https://overcast.fm/+HZUc5QQ4k/35:07