They already had to port their apps or miss out on half the market. If say browser-based phones take 1/3 of the market, then an HTML/JS app will reach the whole

They already had to port their apps or miss out on half the market. If say browser-based phones take 1/3 of the market, then an HTML/JS app will reach the whole, whereas iOS/Obj-C and Android/Java only reach 1/3 each.