All of my leases have had a variation of that clause, except it usually requires guests get permission if staying longer than X nights within Y time period beca

All of my leases have had a variation of that clause, except it usually requires guests get permission if staying longer than X nights within Y time period because the landlord doesn't want the tenant to accidentally allow someone to establish legal tenancy (making it difficult to evict them even if the landlord can convict you).