Lemmy faces the same expectations problems as every free/libre software
It's the same as with Linux, GIMP, LibreOffice or OnlyOffice. Some people are so used to their routines that they expect everything to work the same and get easily pissed when not.
This isn't just open-source software; it's also a collection of servers run by hobbyists.
There is no business here at all. You're not the product, but you're also not the customer — because there is no customer. What you're seeing here is a strictly nonprofit Internet service provided by people who just want to make one.
Which makes Karen behaviour even worse and incomprehensible but most people are humble and don't care to much about some minor problems and a little learning curve
A Karen is a (mostly female) person who demands special treatment for no specific reason, who permanently feels mistreated and set back compared to others and someone who always wants to talk to the highest available employee in expectation this person would take her side and take inappropriate measures against the one that "did her wrong"
I've seen some very demanding posts asking for this or that feature completely missing out on the fact that
a) Lemmy is written by people in their free time and
b) hosted on servers paid by individuals or through donations.
Imho it seems not uncommon to take the free part of FOSS for granted but still expecting to be treated like a paying customer.
People easily forget what they've already got and want more, that's were I see this stereotype.