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Yes, at least some WiFi adapters can. Software used to attack WiFi connections, like
aircrack, does this by listening and logging (encrypted) packets without authenticating to the access point, and then attempting to determine an encryption key. You can just send unencrypted traffic the way you do today, and software could theoretically receive it.However, this probably won't provide any great benefit. That is, as far as I know, just being connected to a WiFi access point shouldn't generate much traffic, so you could have a very large number of computers authenticated to the WiFi access point -- just set it not to use a password -- without any real drawback relative to having the same machines snooping on unencrypted traffic.
WiFi adapters cannot listen to multiple frequencies concurrently (well, unless things have changed recently), so it won't let you easily receive data from more access points simultaneously, if you're thinking of having them all send data simultaneously.
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.