Why do social platforms keep copying each other's features?
Because copying is cheap, fast and low-risk relative to inventing — and because the thing being copied has already been validated by someone else's users, which removes the main uncertainty in product development.
The economics:
Validation is the expensive part. Building a feature is comparatively straightforward; knowing whether people want it is not. A competitor's success is free market research, and copying converts a risky bet into a known quantity.
Distribution is the moat, not the feature. A platform with an existing audience can launch a copied feature to hundreds of millions of people instantly — so even an inferior version can win on reach alone. This is why the original frequently loses, and it is the central dynamic.
Defence against attention loss. If users are spending time on a format elsewhere, that time is coming from somewhere. Copying is retention, not growth.
Features are rarely protectable. Interface ideas are generally not patentable in a useful way, and design patents cover narrow specifics. There is no legal barrier to copying a format, only to copying code and specific visual expression.
Investor and internal pressure to be present in whatever category is growing.
The pattern in practice: ephemeral stories, short vertical video, audio rooms, live shopping, and algorithmic recommendation feeds have each appeared across essentially every major platform within a short period of one proving successful.
Why it frequently fails anyway:
Context mismatch. A feature that suits one platform's culture and use case can land badly elsewhere — audio rooms spread rapidly and largely disappeared.
Crowding the interface, where copied features accumulate and the product loses coherence.
Alienating the existing use case, which is the most serious risk — users came for something, and reorienting toward a copied format can drive them away.
The original keeps the culture, even when it loses the scale.
What it means for users: platforms converge, differences narrow, and choice becomes about network rather than about product — which reinforces the lock-in that makes leaving difficult.