Let's count our blessings that 55 million people haven't tried to join this platform at once.

It would have a lot of severely negative effects:

• Bringing over the hive mind
• Bringing over the influencers and thirst traps
• Crippling all or most of the current instances
• Etc

Given the nature of this platform, you can generally expect slightly more technical people on average or at least people who are not afraid of trying new technologies. The average person will not want to deal with learning how instances work or how federation works. Hell, I was chatting with a good friend who is a senior programmer and he doesn't want to deal with these things.