I don't see how anyone can think that by sending a complete stranger money they're then friends, but it does happen and probably too often.
Does Molly have these types as supporters, most likely yes, some but hardly all. Probably a small percent.
Has Molly encouraged this? Yes, simply by creating the Mammoth CLUB culture she's indicated that they all have a connection. This can be tricky for her, Alan and Max to navigate in the long term.
Are we seeing a fake Molly on screen? I argue NO. What we see on YouTube is a Disney-fied version of Molly and gang in videos as children and the parks are watching there. It's not fake though, just edited/filtered. Molly's personality is one that gets excited by facts and enjoys games. She also complains about crowds, wait times, the systems and rain/water rides.
If you watch her on the livestreams you get the real-feel for who Molly is. She doesn't hide much other than their expense statements, family and other aspects of their personal lives that do not need to be out there. Swears are used appropriately on Twitch streams and Molly is not all cheery all of the time. Don't see how anyone can say she's faking it if they watch these.