Are there any free alternatives of 'Chat GPT' LLM style bots in automations?

Thats also a hard no.
Thats explicitly against the Terms of Service for Chat GPT and can result in your account being suspended and your IP address being banned.

To quote the TOS from Open AI / Chat GPT

“You may not use automated or programmatic methods to use the Services or access any content on the Services unless we’ve explicitly authorized you to do so.”