2 issues:
1) As online brokerages, businesses of Futu and Tiger should be pretty resistant to a supposedly worsening pandemic. But people may be moving their funds from these stocks to elsewhere for better covid-related opportunities since reports of the South African variant is so hot now. This is 0.5.
2) China asking Didi to delist from US and recommend HK listing:
So would any other China Tech listed in US be asked of the same too? Since Tiger and Futu had also been mentioned multiple times by China news and authorities on "information securities" and "licensing" issues. It is inevitable these questions will linger in stockholders' minds.
The main problem: insecurities of not knowing what will China Government's next whim be as they always get what they want, domestically at least.