So all Fin is is a UI on top of the context engineering done by a software engineer who integrated with Fin. It's extremely easy to duplicate Fin's UI and get rid of the $250k fee.
It takes the same amount of time to build a custom agent as an agent on Fin. All Fin does is provide a fancy UI for non-technical people to create rules.
They can create the same rules in plain text. If they want a fancy UI like Fin to do it, just build one in a day.
A rule is just a line of text to an LLM.