While there may be some degree of corrupt hiring of individuals between government and the private sector the majority of this sort of movement is actually due to experience. Governments often hire industry professionals for a more realistic insider views of what is going on from a wealth of private sector experience individuals may possess, and vice versa. To regulate or try to stop this would cause a distinct problem, whereby people would become more and more limited in their job prospects the more experience they gain, this would be a waste of experienced professionals and would be unworkable. Likewise technology and the internet might in fact make it easier for lobby groups to spam or manipulate the issues than they currently do, this is a similar situation where regulating against these practices is untenable, further regulating or even criminalising lobbying wont stop people trying to influence the government and is more likely to boost corruption.
investopedia.com/articles/investing/043015/why-lobbying-legal-and-important-us.asp freespeechcoalition.com/blog/2010/11/08/why-is-lobbying-important
Various examples of a revolving door between complicit bodies that are supposed to exist in parallel to one another have long been known to feed corruption in governments and regulatory bodies. This relationship becomes particularly murky with the presence of lobby groups whose job it is to pressure policymakers, but with modern social media platforms such as Twitter giving a direct line to politicians like never before, lobby groups should be increasingly viewed as obsolete, corruptive and should be restricted. This would go some way to disrupt this corrupt exchange of personnel and could be combined with measures to decentralise government, take some of the power out of the hands of politicians. The internet could go some way to form a greater system of direct democracy worldwide and undermine the power of politicians by giving the power to people directly, and giving government, regulators, lobbyists and private interests less power to make unpopular policy decisions that benefit the few.
theguardian.com/technology/2016/jul/31/trash-talk-how-twitter-is-shaping-the-new-politics