[2.1] Maester links can be given with "Give artifacts"

As the title says, one can give his/her maester links to somebody else with the targeted decision "Give artifact" (e.g. playing character to heir). These links, in turn, can be used to accelerate access to higher learning ranks. I've read that links used to be inherited and that seems to have been fixed as I've noticed them to be destroyed on death every time my playing character dies so I suppose they're not supposed to be transferred in any way of sort.
Restricting them from appearing in the artifacts which can be given (something akin to what is done for valyrian steel) would be nice.

N/A