BEIJING—Fretting about unprecedented regulatory heat for China’s tech sector, some companies are no longer waiting for any official reprimands that may or may not be forthcoming. Instead, eager to pre-empt authorities, they’ve decided to “self-correct”, imposing restrictions on, or even walking away from their own businesses. KE Holdings, China’s largest platform matching buyers and sellers of real estate, is one such example. This year it quietly shut down its VIP services that promised fast-turnarounds for property sellers in exchange for exclusive listings and which had featured prominently on its popular Lianjia and Beike apps, two people familiar with the matter said. The decision to pull the plug on the VIP services was not prompted by a regulatory request but KE, which is currently the subject of an antitrust probe, had wanted to move “proactively” and “voluntarily”, said the people who declined to be identified as KE has not publicized its actions. “It wasn’t …