Subsistence farmers farm for survival, and usually do not look to make a profit off of the crops that they grow. Commercial agriculture is usually found in more developed countries, and the crops are grown in huge quantities to support entire populations for a profit.
Subsistence farmers are more vulnerable to fires because it’s there farm personally and they’d probably have to put the fire out themselves. Commercial farmers grow crops for everyone so they use high quality expensive things to prevent fires on their crops.
Please tell me if this helped ;)