The CC&Rs might provide some monetary fine the HOA may levy for violations. Even if it doesn’t have that and it cannot show actual damages, it could still sue for an injunction to prohibit you from continuing the offending activity. Then if you violate the injunction the court can impose monetary penalties or even jail you for contempt of court.
Note that the issue will be what was intended by the parties in adopting the term “trade or business.” If the case is tried to a jury, it would end up being the jury that decides it, not the judge.

