Wanted to know the pricing if I only use unity for simulation tool for research in AI

Hi, I am using unity personal. I am using unity as a Simulation Tool for creating Reinforcement Learning Agents (using unity ml agents) with unity as the environment. I wanted to learn and develop Reinforcement Learning Agents in unity. Also, I am not earning a single dollar by publishing any software made out of unity. And this will continue for ever since I don’t want to publish any software made unity (with personal license). So, I wanted to clarify that unity won’t cost me any amount for using it as a simulation tool only. I wanted to continue with unity as a simulation tool because unity is much simpler and easier to use.