TikTok rival Kuaishou drops 13% as CEO warns of more regulation, bringing 3-day Chinese tech rally to an abrupt end China's regulatory campaign against internet firms has devastated Kuaishou's share price of late, knocking off 72% since the start of June. – Chinese TikTok competitor Kuaishou lost as much as 12.5% on Thursday. – The slump dragged down the Hang Sang Tech index, which had risen 9% over the previous three days. – China's cyber regulator has fined Kuaishou and other internet companies. – [Sign up here for our daily newsletter, 10 Things Before the Opening Bell.] Chinese TikTok competitor…