Start-ups are very hard to bring to profitability and sustainability. An existing business, once off the ground can usually live for a long time unless the management team really screws up or their market gets disrupted. Even in these cases they can drastically reduce their costs by firing personnel and limp along to better times.

There are also huge conglomerates which gobble up smaller brands, e.g. Kraft Heinz, Time Warner, Alphabet, 3M, etc. They couldn't give a fuck about fragility.

Established businesses are in no way fragile. It's so ridiculous having to read this type of defensive argument.

Employees are a bunch of peons for the big corps, but they shouldn't try to organise because it will be somehow worse for them, right. Any type of group dynamic will not perfectly represent the interests of the group, and yet there are very successful unions out there even in the US, where capital had an long and bloody history trying to suppress them.