Asking for feedback doesn't mean allowing the employees to make discriminatory statements contradicting the company's policies and degrading its image (whether hurting the image of the company was intentional or not).
Once the manifest has been added to the blockchain, it can no longer be altered or removed. This means that the receiver can publicly acknowledge having received the goods it paid for, and won't be able to retract that acknowledgement.
The main point is that, unlike a situation where you would be using a centralized database, there is no need to have a central trusted party to operate the database - the source of trust is distributed among the mining power of all nodes in the network.
Performing a DNS hijack has more uses than just reading the traffic. It gives you information on the amount of data that is sent towards a given prefix (among other uses, this can help for creating DDoS attacks later). It also makes those prefixes unavailable for as long as the attack persists, which is already a form of denial of service.
> Assuming usage is properly curated by parents or other authority figures, smart devices can be some of the most powerful tools for educating children this side of a Greek tutor.
Authority figures in school do not have the power or authority to watch over how the children use their phones. Children that want to information dive on a specific subject are free to do so at home, where their parents can (assuming they are willing to) control what content is accessed and for how long.