@m000gletje i dont think it's that people don't care, it's rather more capacity allocation
for myself: i dont have the capacity to try to emotionally support everyone on my timeline (hell, i dont even have the spoons to reply to everyone on some of my posts)
they'll allocate emotional resources to people they care about, and if you're fedi famous there'll be more people who give a shit about you, and you'll be in people's timelines more
and about the last point: honestly, to a degree, yeah you're right for some people.
but not everyone who feels alone is alone.
if you were alone a huge part of your life, or just got used to it, it's hard to realize you aren't.
you can have people checking up on you, be able to vent and be met with nothing but understanding and care, and yet still feel alone and like a burden. doesn't mean you are.