most ISPs dont, having many dhcp servers and not having developers is not completely trivial to parse the logs and put in some database, or just add some toolin

most ISPs dont, having many dhcp servers and not having developers is not completely trivial to parse the logs and put in some database, or just add some tooling to isc-dhcpd RIPE makes it basically mandatory to use dhcp in order to recive ip space, even though in most places it is completely useless since 2010, you save maybe 5% because literally nobody turns off their routers also of course because there is no ip space now, admins put small lease times like 1 hour, or sometimes even less, so you have constant influx of logs and updates i can imagine those scripts are buggy, misread timestamps and etc