Use due diligence and common sense when such firms show a ready willingness to make you "an offer." Whatever this model is, it is *not* proprietary trading as practiced by respected firms. If a firm offers solid education for a fee, that may be a wise investment. But don't let (thin) promises of prop trading talk you into tuition payments you wouldn't be making otherwise.
For more on this topic, check out this post on Prop Firms, Arcades, and Scams.