Good article. https://medium.com/@favakrypt/the-long-fork-story-of-monero-xmr-cryptonote-code-forks-chain-splits-and-network-upgrades-bc5250b4db5

Good point from this article is:

The protocol changes will also possibly be reflected in other coins, such as Masari (XMR), who announced that they will be “integrating the new PoW changes from Monero as a measure against these centralization threats”.

Masari (MSR) on the other hand, is considered a “friendly project”, as its devs have been committing back to the parent project, which was seen very positive in the Monero community => Masari

It is very problematic to see different “fork projects” just capitalizing on the Monero project but not actually committing back to the original source code, as there are enough issues that could be tackled on github. => Other Monero Code Fork

The author has good knowledge about Cryptonote Coin.