I think you're getting confused with the term 'free lease.'
Typically, in my area, the term "Free Lease" only applies to someone taking a horse off the properly. For example, an individual will 'give' you their horse for 'x' amount of time. It can be kept at your home, at your chosen boarding facility, etc. During the agreed upon time, the person leasing the horse is responsible for all bills. Farrier, vet, board, training, etcetc. This may come with stipulations (you must feed x food, or you cannot leave your property, or you must use x vet, etcetc) but often does not.
"Half Lease" is usually at the owners chosen barn or facility.
This usually dictates 2-4 rides a week, and is very often half the board. Typically, the owner is still responsible for vet/farrier.
"Full Lease" also takes place at the owners chosen barn or facility.
Usually this means free access to the horse, but can sometimes has a cap (no more than 6 rides a week, for example). In this situation, sometimes the owner is responsible for vet/farrier, but it is usually the person paying for the lease.
All of these usually involve a contract to protect both the owner and the individual paying for the lease.
The sensitivity of the internet baffles me.