A very basic rule in developing any app that has a server and a client is that you never trust the client. Never. What do game devs do? They trust the client and try to make it trustable. That will never work. The anti cheat should be on the server : a player flying would be very easy to detect. Don’t send the position of every players to every players.

That guy is a) a relentless liar and b) absolutely insane Why would you say those things? Why contradict yourself at 20 days interval publicly?

Nobody is forcing you to use the cloud, you can host your apps on your infrastructure. Of course the cloud has its uses, but I think it is way overutilized and many companies could save quite a lot of money if they returned to on premises.