Customer support is largely useless today and can be replaced by machine. It only exists because average (dumb) people tolerate a human customer service rep saying "I'm sorry but you're screwed" better than a web page saying it.

Salespeople says BS to sign you up, only vaguely coherent, backed by some basic database facts about the product/price, so GPT can handle that. Think about Donald Trump: Huge fan base of paying customers, barely distinguishable from a chatbot.