A ranche owner can alter the emission rate, or terminate the ranch prematurely and retrieve the remaining balance. In case of any concerns, you can request the owner to renounce the ranch contract.
It is advisable to conduct your own research on the produced token, as in very rare cases, the token contract may contain some special logic that could result in issues.
When the remaining balance runs out, the ranch will end automatically. Please note that harvesting operates on a first-come, first-served basis, so it is important to harvest in a timely manner.