Why is it that social media platforms seem to invariably deviate from the thing that made them successful and different?(*) Micro-blogging platforms adding long

Why is it that social media platforms seem to invariably deviate from the thing that made them successful and different?(*) Micro-blogging platforms adding long-form posting features, long-form video platforms giving 10 second clips a go, short-form video platform increasing video length... The lack of originality in this field is astounding. * Money and market share, I know.