This was one of those games that actually taught me how to play the digimon playing card game legitimately. Do you want to find anyone playing with digimon cards outside of the game? Good luck with that with everyone thinking it was just a Pokemon rip off and seemed to have killed the chance to ever get the physical cards in my area.
Although I can not buy of the cards online with a lick of a button, getting this on GoG would help me catch up on the good ol days of learning from a simple PS1 game that has all the necessary card needed from a bye gone era. Maybe it will even convince Bandai to invest in making a newer version of the game, be it set up more as live service game similar to MTG and Yugioh in the online space.