Limit sharing Hotspot connection with 'Change TTL' - MikroTik RouterOS Script
To overcome the use of Hotspot Vouchers redistributed (repeater) by using the Wifi Tethering / Wifi Hotspot android application, we can solve it by using Change TTL in Mikrotik.

/ip firewall mangle
add action=change-ttl chain=postrouting new-ttl=set:1 out-interface=LAN passthrough=no