Yes, they could have a FW update that does that but it would violate law to do so since the drone will reliably come in at over 249g with the standard battery (which seems silly to say because most come with the extended battery, thus making it...
That's the point. CA does have a problem with droughts and fires. Is a $300k fine excessive? Sure, but a private citizen launching a fireworks display of that size is also excessive.
In a state that appears to be made entirely out of kindling, and after years of one wildfire after another, it's hard to find sympathy for people illegally setting off fireworks.
You can't set off 300 fireworks all at once, not without burning...