They already have Co-oP in Tarkov, what they don't have is the progression part... So how much resources? Taking players away from the PVP part as you mention is barely if at all a thing, most people who play Singelplayer Tarkov or what a coop mode have either quit the game or ...
#Escape from Tarkov 2+ 3+ #Singleplayer Tarkov Server 4+ 5+ ##After server installation 6+ 7+ Run the server once to generate the necessary config files for the coop mod, then edit`coopConfig.json`in`/home/container/user/mods/SITCoop/config`with your external IPv4. ...