The proof of delegated participation approach aims to reduce security risk and the required computational resources of the Blockchain as the stakeholders

Yes the security threat because of censorship are also discouraged by disqulifyg guilty and witnesses also need to upload the transaction signature within 24 hours of block verification.

PoW is considered not to be easily monopolized as nodes with high computational power participate in block validation while DPoS is likely to be monopolized as validator nodes that rely on the votes of the users

You are right . Theoritically that's possible butbin practice there are mechanisms to curb such malaciois consolidation .

Good luck