People don't use hashtags on a lot of sensitive topics, because they already fear suppression within Tiktok. The US based operation is already partially owned by Oracle (and all of Larry Ellison's shenanigans) and Walmart as of 2020. For example, since October, Tiktok creators went to extreme lengths to mask the content of pro-Palestinian news, including using hand written note cards or other things that are difficult for automated filters to flag. Anti-establishment messages were already suppressed and widely brigaded by Zionists.