You don't sell software you sell software licenses. Details on how licenses can be revoked would be outlined in the EULA. Hypothetically you could do that but y

You don't sell software you sell software licenses. Details on how licenses can be revoked would be outlined in the EULA. Hypothetically you could do that but you wouldn't in practice. Customers don't tend to enjoy bait and switch tactics. Companies that switch to a subscription model typically issue a new version without revoking any licenses.