[snazz]

For Apple specifically it's called "Sherlocking".

[geoelectric]

That one is a little different. That's when Apple clones your app into their OS as a core feature, thereby completely killing your market.

It usually implies Apple deliberately studied your specific app or replicated it based on details revealed in B2B licensing/acquisition meetings, similar to what MS pulled with Stacker back in the 90s.

https://thehustle.co/sherlocking-explained

https://en.wikipedia.org/wiki/Stac_Electronics

[MenhirMike]

Don't even have to go back to the 90s, just recently Microsoft pulled that with AppGet.

[laborcontract]

Sherlocking is also considered a good thing nowadays. It acts to expand the market by bringing about awareness of such a feature.