Two reasons: NASDAQ values Tech higher than LSE and inclusion in the Nasdaq-100 will mean funds/indexes have to buy in which will boost the share price. This is the smart choice for Masayoshi Son to maximise ROI.
Masayoshi Son is desperately needing to make some smart choices after making some of the biggest investment blunders in history through the Vision Fund... I agree this one is the way to play it safe with what could be the best investment in his life.