Expressions of interest:
If they like you, they will at some point in the not-too-distant future offer you a job.
However, if they don't like any of you who "express interest", no-one will be offered jobs. As they haven't actually said that jobs are available, this is not dishonest.
The term is however a two-sided coin. If you express interest and you don't like the terms on offer, you can say no without being seen as wasting their time. After all, you were only expressing interest, not actually applying for a job.
Good luck.