No, there is no such limit. I think that is also a natural process somewhere. Infrastructure is built and works with X users. But if the user base reaches a value of, say, 10X, the infrastructure may not be able to handle the increasing traffic. Then it will be seen how to make the infrastructure ready for the increased traffic. Presumably, such efforts already exist where there is no acute need for action. But you'll have to take a look at the developer areas to see if there are any proposals or the like that deal with scalability. In principle, the process described at the beginning repeats itself until the infrastructure can cope with the traffic or it has reached its peak. But that will probably be a very long way off, if at all.