I disagree. Unsolicited feedback lacks context and might not be intended to help the developer. Feedback to someone you don't know should be offered only if they're explicitly asking for it.
Sometimes people want the participation and attention that exists on social media without the reason that attention exists.
Of course, advice should always be kind. And allow people to ignore you if they want; this includes not "piling-on" and restating a criticism that has been said by others.
That's literally all they said.
How can you disagree about what one individual says they themselves want?