Because that is what people get and see and tell here if they can not access the site. I think it is normal if they complain about why they can not access it because they think that if they tell here, they can get many solutions from us so they can try one by one and who knows that can solve their problem.
If they should try a new PC or new device, that will not be possible, but maybe they can just restart the browser, clean everything related to the internet, or even restart the modem or activate VPN. If they can not access the site using many ways, the last thing that they should do is just move to the other sites.
The thing is, if they come in here and say "I" can't reach the website, what should I do? Then that is fine, but if they come in here and say there is something wrong with the website, they can go to any website online but can't join here, then they put the blame on the casino which has thousands playing at the same time.
I agree that if you clear the cache, or even do incognito mode, that would be more than enough for 90% of the cases, add in changing a browser and so forth in there and you would get something very likely to be solved in that case. If it doesn't work even after all of that, then you could try to get help from support instead of here.