Also note the CGNAT and 1TB data limit for their 'Unlimited' Buisness plansThat's fair enough, wisp is a different beast.
That said, in case you're not that put off by mobile, EE have an unlimited data sim business contract on promotion for £23.
If you're in a 5G area you could be looking at well over 100 mbps. I've never seen mine go below 200mbps, in fact it's usually over 300mbps dl, 60+mbps ul. Yes, there is cgnat and 30ms pings, but I found that not to be a problem in my case.