Why do tech companies get a hand-wavy pass for basic customer service just because they're really big now? In what way is tech special compared to literally anything else?

If you can't sustain a business, it shouldn't exist?

You don’t need to offer support to sustain a business. Look at Ryan Air, who are notorious for not doing so. Support is extremely costly and basically impossible to do well at a large scale. I forgive them for having some issues under their circumstances.