Life isn't exactly an "accident." Your parents had to make a deliberate choice to have sex. Now, there is some sort of probability involved in the chances of pregnancy, which sperm cell creates a new person, and that new person actually surviving all the way to birth and beyond. But ultimately I wouldn't call life an "accident" outside of some very specific scenarios involving the parents. Your parents chose to create a new person, and that new person was you.
The purpose of life? Who's to say? Ask ten people and you'll get ten different answers. Some people spend their entire lives trying to answer that for themselves, others ignore it entirely. It's a question only you can determine the answer for yourself. But my answer to the question will likely be entirely different from your answer.
Of course, every instance has the right to preserve their own echo chamber. That is not a problem, but it could be later when users keep seeing communities from one instance go away and come back, or users get effectively “banned” from interacting with those communities because they signed up on the wrong instance. Even if they refederate, they’ll be seen as unreliable by everyone else.
Its like banning all people who drive a Toyota from parking in your parking lot because some people you don’t like drive a Toyota. Sure, you have the right to do that, but you will be losing out on the parking fare of those big communities of Toyota drivers, and even people who dont drive Toyotas but see you banning them. Then you get less traffic, less users, people leave, and it becomes a parking lot that is 98% empty.
This leads to hyper segmented communities, which have benefits, but normies don’t really like when a place only has 3 active users.
It probably would have been beehaw if they didnt defederate so early. Given the viewpoints of the people in charge there expressed in their comments on defederating and refederating, I suspect that Beehaw is going to have a consistent problem with constantly defederating and refederating.
Lemmy.world is most likely to grow the largest now because the barrier to entry is low compared to the other two. Additionally, the instance name gives the impression of a general or catchall instance moreso than lemmy.ml or beehaw.