Pi does not allow any one to have have multiple accounts. Pi wants to remove out the multiple and bots accounts. For this purpose Pi is doing KYC (Know your customer). Since multiple accounts and bots account cannot be verified by KYC, these accounts and their Pi will be burnout, is clearly mentioned by the core team of Pi.

But this will take time. Since only 100000 slots are available for KYC verification in a month, legitimacy of more than 13 M users will also take time. This burning is only possible after the verification of all legitimate users. Core team is developing different techniques for KYC verification.