I have been told that by connecting my Airport Express device to our LAN, that I am affecting the access of the other users. Is this true?

I live in work accommodation in a remote area. All living in the accommodation are using one internet system. I have a wired connection, but this does not allow me to use my iPad. I have been using an Apple Airport Express device to gain my own wireless internet. I have now been told to disconnect it as it is affecting everyone else's connection speed. Is this correct?

QA AirPort Extreme Base Station

QA AirPort Extreme Base Station

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