The post is light on details. I'd guess the author ended up hammering the API and they decided it was abuse.

I expect more reports like this. LLM providers are already selling tokens at a loss. If everyone starts to use tmux or orchestrate multiple agents then their loss on each plan is going to get much larger.

There are people on twitter bragging about using 100s of agents. Here's one example: https://twitter.com/nearcyan/status/2012948508764946484