Soft bans are harder to determine than actual written law. With law you can say "This kind of place doesn't exist because the law says no". With a soft ban you are disincentivized in some other way, for example the thread of civil litigation or being harassed by law enforcement on a regular basis.

The US for example is a litigious culture and just having to deal with suits is expensive and can prevent a lot of things that would otherwise occur in other cultures. For example injuries occurring on a property.