這是一篇有關中共反壟斷法的文章，想詢問一下翻譯是否正確？
主文的上一段:
Foreign companies that fall foul of the law are treated more harshly than
their domestic counterparts. When the NDRC alleged that China Mobile and
China Unicom, the country’s main fixed-line carriers, were behaving like
monopolies, the result was a “recommended restructuring” that included no
punitive measures. By contrast, an investigation of western car companies and
their local partners over similar alleged transgressions resulted in big
fines.
前文:
Almost all the fines issued by the NDRC since China’s antitrust law came
into force in 2008 have related to the fixing of retail prices.
自從2008年中國當局實施有關控制零售商品價格的反壟斷法以來，
幾乎所有罰款都是由中國國家發展和改革委員會(NDRC)所懲處的。
主文：（翻譯得有點不到位，想請教如何修改？）
This is not unlawful per se – only when it restricts competition.
只有當廠商（it）限制市場競爭的時候，才會違法。
But the regulator has barely even attempted to prove that this is the case.
但是中國的監管單位通常很少，甚至沒有試圖去證明這種情況(限制市場競爭)
。不知道有沒有理解錯誤?