I have to disagree with that, snapchat was just as innovative if not more so in the early days of tiktok and musically in the space around camera filters and editing.
There are two big things that make tiktok unique. The for you page, and shared sounds that are able to go very viral rapidly. No other platform has been able to circulate viral videos as quickly as tiktok has proven to be able to, and the for you page, rather than encouraging people to actually follow individual accounts, means that people are actually seeing the videos that keep them on the app the longest (and in turn off other apps), rather than having to curate their own feeds.
There are two big things that make tiktok unique. The for you page, and shared sounds that are able to go very viral rapidly. No other platform has been able to circulate viral videos as quickly as tiktok has proven to be able to, and the for you page, rather than encouraging people to actually follow individual accounts, means that people are actually seeing the videos that keep them on the app the longest (and in turn off other apps), rather than having to curate their own feeds.