OpenTTD is a labour of love, created by people. The amount of available labour is unfortunately finite, and reviewing contributions takes a lot of work.
As such, we do require that you understand the code you submit, and Pull Requests which are clearly written by AI tools for you or which are submitted with a description written by an AI will be rejected. Additionally, you are responsible to make sure you actually have the proper rights to license your code under GPL and add attribution where required.