I'd say it's more a consequence of subsidizing a highly versatile good. It must be continually regulated to ensure the subsidies aren't exploited for something

I'd say it's more a consequence of subsidizing a highly versatile good. It must be continually regulated to ensure the subsidies aren't exploited for something that was outside the original intention. Sadly the increased regulation also reduces individual choice in favor of the governments vision of what's best for the nation.