You refer to Bitcoin Cash (BCH) [1]. You are right that it split from Bitcoin BTC to follow the original scaling plan: increase the maximum block size and improve the software to make such bigger blocks work in a P2P network. Its adoption has been slow, but don't forget that it had to begin from scratch, as BTC was the one who retained the network effect. That's one of the difficult problems of cryptocurrencies: bootstrapping.
The big question for me is where would we be today if Bitcoin BTC hadn't sidetracked the original scaling plan and its adoption hadn't stopped in its tracks 3 years ago. Remember when Steam accepted Bitcoin? Microsoft Xbox Online? Dell? NewEgg? It was almost every week I read about some big company starting to accept Bitcoin. Then when they realized people were not using it because of the raising transaction fees and long confirmation times they dropped it.
[1] https://www.bitcoincash.org/
