Take, Take, Take
My story of how in 2008 I designed an app (published in 2013) that became unwittingly the prototype to Puzzle Rush, the world's most viral and addictive chess app ever made is becoming widespread knowledge. This can be read here if you want to look at the details again.
Chess Master Cube was the precursor to Puzzle Rush and clearly was a prototype for the Puzzle Rush design. This stands even if the CEO of Chess.com says he never knew of its existence, which I believe he is telling the his truth about. His development team however should have followed due diligence and checked what had already been developed before publishing their app and not knowing if someone in the team had just fed them either knowingly or unknowingly a design they copied from an earlier app or prototype of another app. Chess.com acknowledged this point and I thank for that. It is rare for a company to be as honest and gracious about accusations about their alleged intellectual property theft.
However as I told my truth I was contacted by many people who said this had happened to them and they had got nothing from their ideas but had this horrible feeling of knowing others were profiting from their hard work and inspiration.
A photographer can point their camera at a chess player moving wooden pieces of 64 squares who gave only implied consent by being at a public event and this work of art is immediately their copyright. Another photographer can stand in exactly spot right after the first photographer and take an identical shot and still their copyright is also transcendental and unique even though to the untrained eye it looks the same. They get their work respected.
A software engineer can create or develop a chess app which is a uniquely built and existed nowhere before it was written by that software engineer, but along comes a big website can come along and copy it directly or replicate the app's functionality. The source code of the app could run into 50,000 lines of unique code yet anyone can claim to having created it and the original developer is not credited at all or receives no concurrent copyright for the app.
Nothing is created in a vacuum and I benefited from the contribution of people like Michael de la Maza's book "Rapid Chess Improvement" were he outlined essentially the requirements
A new book published in 2019 which describes essentially the same method for tactical improvement prescribed in 2002 by Michael de la Maza. The book is the "The Woodpecker Method" by Axel Smith and Hans Tikkanen. Did they know about the Rapid Chess Improvement method? Your guess is as good as mine.