To be fair, Stray Incubus was probably THE game which leaked the earliest with a relative small number of paying Followers. There are other games here which leak really quickly, but those Devs usually have the income to not care too much about it (e.g. Eternum leaked within minutes after the Release for the highest Tier, but Caribdis makes enough money to not have financial problems because of that). Stray Incubus however did not have that much income, but still leaked very quickly.
Obviously you can discuss whether or not the Dev could have done something against that - and it was discussed multiple times here. But sadly the fact is that a game with a relatively small following leaking that quickly was indeed the issue. Not that it leaked per se.