Ethereum's planned PoS is not delegated PoS. Instead, it is actually byzantine fault tolerant (and validators/stakers get punished for acting badly).

For example, if a current validator signs two blocks that conflict in any way (aka, creating two conflicting forks), they lose their deposit.

Also, many of the issues with PoS have effectively been addressed at this point (nothing at stake, stake grinding, etc). This comes with a compromise of weak subjectivity - namely, that when a user syncs a client for the first time, they have to start with a valid hash from w/in the past couple months that they trust.

After this initial starting point, as long as they sync their client every-so-often, no further trust is required.