This is the principle, but the local laws require visitors to be able to support themselves and not be burden to the society; if you are unable to do this you will be sent back to the mainland.

Jobs are very difficult to come by, and as 90% of the housing in Longyearbyen is corporately owned, finding a place to live without a job can be difficult. [1]

[1] - http://www.nord24.no/her-skal-ingen-fodes-eller-do-men-etter... (in Norwegian)