All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah and that Muhammad is His slave and Messenger.
There is no harm in giving the number of institutions whose work is mixed between what is lawful and what is forbidden, like restaurants, to someone who asks for it. It is not necessary for him to verify what he wants from it.
As for the institutions whose activity is based on purely what is forbidden, like gambling and so on, then it is not permissible for a person to help someone who wants to contact them and deal with them in what is forbidden, as it is Islamically prohibited to cooperate with sinners in their sin and wrongdoing.
Allah Says (what means): {…but do not cooperate in sin and aggression.} [Quran 5:2]
Allah knows best.