Does the hotel have the right to keep others out of the hotel?

Yes, hotels are selling goods whether they provide accommodation services or cleaning services, so Article 226 of the Criminal Law has specific provisions on goods, and it is not allowed to buy or sell them in any way. Then, if you understand this, other hotels are reluctant to sell their goods (providing accommodation and cleaning services, etc.). There is nothing you can do about you.

And if you don't check in, if you enter the hotel, people can ask you to go out and disturb public order.