Germany blocking regulation of car emissions and it's control/manipulation of the Euro to ensure its advantage, France's support to state industries and use of its intelligence services to gain competitive business contracts, the US subsidising research through military investment, Delaware Corps, Swiss banks being Swiss banks, Scandinavian companies using bribes, various favoured semi-state companies in Eastern Europe with suspiciously tight political connections, Israel using state resources and insider access for trusted businesses, Korean State lead industry, Chinas intellectual property theft, Italy and Greece's lack of tax collection, Dutch taxes, Malta's money laundering, the UK using Trusts, the Island of Man and BVI to allow companies manipulate tax but keeping it at an arm's length, UKs revolving door between intelligence/gov/banking, the UK letting dodgy money wash through London.
Ireland is one of the worse on the corporate tax but in many ways we are just a rocky previously poor outcrop that has found a way to be competitive openly. Many others do unfair things in more hidden ways and everything needs to be on the table.