Why would Instagram even try to be TikTok to begin with? Why show a firehose of short videos that just makes everyone who made your platform what it is, hate it

Why would Instagram even try to be TikTok to begin with? Why show a firehose of short videos that just makes everyone who made your platform what it is, hate it? How will you tell who is leaving the platform because it's suddenly TikTok (like me) vs who's leaving the platform for TikTok?