The typical home routers don't support more than 20-25 simultaneous connections last i checked. I'm sure there must be professional devices that allow thousands of connections like they use in public wifi spots but I'm also sure they would be much pricier.
At this point, it is just a pursuit for understanding how these things work and if what I want can actually be made possible as alternative use case of WiFi, especially given how ubiquitous it is.
Thank you for indulging me nonetheless.
Those have a modern use too. I keep my power bank in the bag and use it to charge my phone on the go.