China’s Ministry of Transport has summoned four leading freight-delivery platform operators and warned four internet ride-hailing companies over recent driver complaints, in a sign of Beijing’s continued scrutiny of the country’s massive tech sector after a year-long crackdown. The ministry on Friday said it has summoned four internet freight delivery firms, including the cargo businesses owned by DiDi Global Inc. DIDI, and 58.com Inc ., to discuss recent driver complaints about arbitrary pricing rules, membership fee increases, unfair competition and illegal practices such as overloading. The ministry said it has also warned four ride-hailing platforms run by companies including DiDi...