this assumes some kind of only one reason. its also neglects the justification, versus the motivation question.
there is certainly a branch of GOP policy that is motivated by corporate cronyism. but its justified to the folks who are hurt by it, because of racism. like the most recent tax cuts. most GOP fiscal policy fits this bill.
there is also a branch of GOP policy that was explicitly motivated by racism, and is now justified by "well thats how its always been" i mean there is a branch of liberals that are in the same camp too. "thats how its always been" is a strong motivator, and without being "woke enough" to deconstruct why thats why its always been (hint: mostly racism), you get folks not happy with change justifying policy based on it. examples of this would be redlining, most drug law, the entire existence of suburbia etc etc
and then you have motivated by racism, justified with racism policies. trump has certainly upped the number of these. the republicans have been brilliant at obfuscating the reasons for these, but recently the veil has been lifted. such as the numerous quotes, and even court testimony (most recently in NC) of voter ID laws being explicitly stated to have been made for racial reasons. just last week NC literally in court stated the reason for reducing voting days/hours was to stop black people from voting. gerrymadering often fits this category too.
so there is a variety, but somewhere, in almost any GOP policy, there is racism. i literally cannot think of a GOP position that racism isn't a part of.