(a) sufficient political donations/bribes to get lawmakers to draft suitable language themselves (or via their staff)
(b) a combination of political donations and a worldview on the part of lawmakers in which it is "just normal" for those affected by regulations to draft them, such that you yourself are able to draft the legislation.
There are levels of government where neither of these require incredible levels of wealth, I suspect.
Both could be stopped by limiting political donations and a political culture in which "the chemical industry writes its own rules" is self-evidently corrupt and/or non-sensical.
Whether any of these require incredible levels of wealth or not is moot, I think. The reason for that is that it only matters when 'lesser levels of wealth' come up against 'greater levels of wealth' and the latter will always win that confrontation.