I think you and the other are right that most of the people who would be searching for this type of answer would be involved in some crime as part of the process, but I can also think of situations where this can be used for legitimate reasons and most of these are outliers but still legitimate.

The (current) top comment here mentions a few, one being if you’re famous and want to avoid, for example, an Amazon employee or a USPS employee knowing who you are and where you live based on the packages you receive. You may be trying to lay low from actual criminals and can’t rely on police because of corruption reasons. You may be a whistleblower and can’t rely on the government for protection but still need things and shipping is objectively much safer than physically leaving your house for your necessities or things needed for your operation. Or you could just be a paranoid person, which is okay in the sense of not breaking the law, just someone who values their privacy for irrational reasons, but nothing inherently illegal or even morally/ethically wrong.