Games with a subscription based model have a constant flow of content to keep their subscribers happy... Swgoh does not. That's what the community has been asking for repeatedly for years. Adding new characters behind grinds and pay walks is not content.
If your trying to compare swgoh to say swtor or wow in terms of mmos, you will notice a significant difference. While wow has been in decline with content faltering, bioware has done an amazing job on swtor with the constant addition of content.. And you don't even need a subscription to experience 75% of that. Hell swtors model is subscribe once to unlock all the recent content for $15 then play away.. For hours upon hours... After that first initial $15 you can unsub and be a preferred player still giving you access but somewhat slowing your progress.. But it is still accessible.
Swgoh can sustain that model, yes the player base is likely there, but we haven't seen any new actual content since tb/tw and hsith.. (geo TB doesn't count, it was a reskin).