Interesting. I've been watching various Wi-Fi HaLow modules for a couple years now. They are interesting alternatives to LoRa and Zigbee which seem to have low data rates (from a quick Google Search) of best casees 50kbit/s and 250kbit/s respectively vs. Halow's best case 15Mbit/s. Obviously, this all depends on a lot of factors (coding scheme, range, noise, etc.).

It's unfortunate that the modules cost so much (single unit costs):

Alfa Network ($20): https://asiarf.com/product/wi-fi-halow-sub-ghz-wireless-modu...

Morse Micro ($30): https://www.mouser.com/c/?marcom=191003943

Silex ($33): https://www.mouser.com/c/?marcom=191003943

As with all these types of unpopular modules, the SDKs and software documentation are not that freely available, except for these $70 SparkFun Pi HATs: https://www.sparkfun.com/products/19956

Those all have FCC certs, but if you get modules from China, without certifications, it can be a lot cheaper ($5): https://www.alibaba.com/product-detail/New-Generation-900MHz... But who knows how they actually perform or what documentation they actually have.

I would enjoy making a long-range Wi-Fi camera with these (assuming you can buy a base station Wi-Fi adapter for your computer, with drivers). If this random Google Image is anything to go by, https://www.macxdvd.com/mac-dvd-video-converter-how-to/artic..., depending on if you encode video into H264 or H265, you might be able to fit a 60fps 1080p into a stream at a decent range.