They do not have "big lengthy campaigns" in other systems:
Mighty Nein (D&D) 141 episodes
Vox Machina (D&D) 115 episodes
Bells Hells (D&D) 81 episodes, ongoing
Undeadwood (Deadlands) 4 episodes
Vassal and Veil (Candela) 3 episodes
Needle and Thread (Candela) 3 episodes
Tide and Bone (Candela) 2...