Chinese-owned TikTok, sponsor of the Women's Six Nations rugby, operates in a parallel world, where it's loved by its users but viewed with suspicion by many institutions in the West. Photograph: ©INPHO/Giuseppe Fama Ireland is likely to implement a top-up tax, which would apply to major companies with Irish bases, rather than a new 15 per cent headline tax rate, according to a feedback statement from the Department of Finance to be published shortly. The top-up tax would apply an effective 15 per cent rate to the earnings of major companies, but taking this route would mean that 12.5 per…