Alibaba founder Jack Ma has been living in Tokyo for almost six months after disappearing from public view following China's crackdown on the tech sector, the Financial Times reported yesterday, citing multiple unnamed sources. The billionaire has kept a low profile since the crackdown, which has included Chinese regulators scrapping the IPO of Ma's Ant Group and issuing Alibaba with record fines. But the FT said he has spent much of the past six months with his family in Tokyo and other parts of Japan, along with visits to the United States and Israel. In recent years, Chinese officials have taken aim at alleged anti-competitive practices by some of the country's biggest names, driven by fears that major internet firms control too much data and expanded too quickly.