Important to my work future, Can i use nod-red to make REST API for big websites

thanks a lot @TotallyInformation , I've spent time searching in the forum and I found a similar discussion

https://discourse.nodered.org/t/node-red-use-as-a-full-stack-backend/50392/15?u=xtwiny

my question is: can node-red REST API handle a million users or more but must use multiple instances?
can you explain to me how it's done?
I searched for node-red multiple instances and i found something like that
node-red -p 1881 -u /home////
node-red -p 1882 -u /home////
node-red -p 1883 -u /home////
is thats mean i make different clone my node-red API in many folders and make it working in different paths?
if its a true, how it does working?
if solving is correct , how can i do that?