Several new draft antitrust rules released by China’s market regulator threaten to place additional restrictions on the country’s Big Tech firms ahead of an updated Anti-Monopoly Law taking effect. Under one of six proposed rules released by the State Administration for Market Regulation (SAMR) on Monday, a planned merger or acquisition will need regulatory approval if it involves one company with revenue surpassing 100 billion yuan (US$14.9 billion) and another with a valuation of at least 800 million yuan. If the new rule goes into effect, it will change a process that currently relies only on revenue as a benchmark…