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The average Supercharger session lasts about twenty minutes. I don't see a very strong business model for casinos subsidizing Supercharger power. Level 2 charging is a different story, and they should absolutely offer free power for that.
...I don't know if the average SC of ~20m is really enough (assuming one is not spending ~1h to do a sub 5% → 100% V3 charge).
Now if you're looking at something like Urban SCers - or perhaps "discount/free V3" SCers - who max out at ~72kWh you're then looking at ~1h45m to go from sub 5% → 100%.
I'd also guess it'll take around 40m to get the same charge 20m on a normal V3, then I think you've got captive customers far more likely to patronize the casino as they'll have the time to do so.
20mins just isn't enough time...save to run to the mens' and maybe get a coffee.
Will also note L2 doesn't seem like the right fit either to drive a material amount of business at the margin as it's too slow (ignoring overnight patrons).