As many as the developer can afford. There's a difference. You could argue that you just move funds from one bot to another when it becomes widely known and blocked as a bot, but then we have time. The longer the funds have lived at the pk, the more you trust it is a real nym and not an attempt to game accounts.

It's similar to what joinmarket uses for Sybil resistance.

A JayZ with 1Btc for 1 year is more reliable than one with 1 BTC for 1 week.