False statement. If even one of those accounts is omega, they’re contributing to CCP’s income. Plex is driven by player demand, if demand in-game falls so too does the amount put onto the market by people who no longer feel it is worth their real money. Plexing an account generally earns CCP more income than a monthly sub does.
It’s a small impact to see one plexed account unsubscribe, but it’s not zero.