Why are 3rd party apps still working?

Joey for Reddit was my reddit client of choice for several years now. There never was any announcement from the dev regarding the future of Joey.

So there were speculations if he made a deal with reddit and would continue with a subscription tier.

Boost however officially announced they would shut down with the API changes coming.

I just checked and both apps are still going strong.

Shouldn't they have stopped working on June 30th?

Amy idea what's going on?