Each exchange can make its own rules for what it will list and how it will trade (within the broader SEC regulations).
So yes it’s just a way to capture fees from listers who like your exchange better as the primary listing exchange and from market participants that must be in every exchange (latency sensitive HFT).
None of the many exchanges that have started have made a dent in the existing duopoly for real share listings that Nasdaq/nyse have. But some exchanges have made good business off of other products like etfs.
So yes it’s just a way to capture fees from listers who like your exchange better as the primary listing exchange and from market participants that must be in every exchange (latency sensitive HFT).
None of the many exchanges that have started have made a dent in the existing duopoly for real share listings that Nasdaq/nyse have. But some exchanges have made good business off of other products like etfs.