Not who you asked but: Public wifis tend to stop working if too many users log in. For me that frequently happens at airports. They still broadcast and pretend

Not who you asked but: Public wifis tend to stop working if too many users log in. For me that frequently happens at airports. They still broadcast and pretend to have a connection but no throughput. So switching it off is the only solution. When I then go somewhere else (esp abroad), I'd still like to join the next wifi. Having it switched off for the rest of the day can be very expensive.