Tether off your phone. I rarely use public wifi, too much hassle.

Don't have power though and I won't be around for long.

Yeah, have enough traffic on my phone that connecting to wifi that has hundreds of other people connected to it is generally a bad idea.

If my network slows to a crawl, it’s always because I’ve accidentally connected to some public wifi network.

Seems like less of a problem these days. Most laptops will give you hours of use without charging. M1s and Chromebooks basically give you an entire day.

And a fair number of people just work on their phones for a lot of purposes.

I suspect that would decrease your potential market significantly.

If people only come to your place for wifi then they're not the customers you want imo.