Exit is a link can this be a button
in collection point atleast I tell but I see such use other places also even returning back of galatic locater etc the reson behind this move ...
there is 4 tab to jump each time in a screen for a screen reader user to go to such places if those points like exit or return be a button as in window eye or other screen reader we can press to "B" and it jump to next buttons that will be exit and jump all the 4 tab at one go and move ahead in screen