Serverless is just a new word for single-serving computation.

Everywhere I travel, tiny life. Single-serving sugar, single-serving cream, single pat of butter. The microwave Cordon Bleu hobby kit. Shampoo-conditioner combos, sample-packaged mouthwash, tiny bars of soap. The people I meet on each flight? They're single-serving friends.

~ Fight Club

It's the gig economy for servers. Rather than a server having a stable comfortable job, it must get one piece of work at a time and only gets reimbursed for services performed, not for its availability.