I think you misunderstood what the above commenter meant when they wrote that risk of squatters makes it "less profitable to buy and rent out apartments".
Because of the additional risks of squatters, landowner will either have to take additional security measures (and make up the costs with higher rent) or accept the risk of squatters (and make up that risk with higher rent). In either case, the rent getsor expensive.
Because of the additional risks of squatters, landowner will either have to take additional security measures (and make up the costs with higher rent) or accept the risk of squatters (and make up that risk with higher rent). In either case, the rent getsor expensive.