You mean the risk of centralisation?
I do already deliberately link to smaller instances when recommending places to sign up, and I do explain what federation is and why it is a good idea for everyone.
However, I don't link to instances with tiny numbers of people (less than ten for example) because it is difficult to judge their track record.
If non-tech people lose their Fediverse account because their instance shuts down, they will simply go back to centralised services.