The National Intelligence Law was passed by the CCP, the Chinese Communist Party, in 2017. It requires any organization to assist or co-operate with state intelligence work. That's on top of a 2014 law that says relevant organizations may not refuse to collect evidence for an investigation.
Does that cause concern? What assurances are you able to extract from ByteDance that their responsibilities to the Communist dictatorship in Beijing won't supersede privacy requirements here in Canada?