The rationale is that what other people here are saying - that Bumble (Badoo) should have paid them on company time to contribute to open-source - was already happening.

Bumble owns under the Badoo repository two projects, called badoo/MVI-Core and badoo/RIBs. These libraries are developed on company time by employees, as open-source.

If you check MVIKotlin and Decompose, you'll see that they're conceptually equivalent. You could therefore argue it is, in fact, using company resources.

But badoo/MVI-Core and badoo/RIBs are the two official frameworks written and released by Badoo. Then, what is MVIKotlin and Decompose, and does Badoo own the rights to it - if it was developed on company time, based on pre-existing source code owned by the company?

It will be something that we might never know

Maybe juste to spite a leaving employee.