@suvidu @rtp -- That is the essence of the Alt4You hashtag.
If I see an awesome message without Alt-Text, I will boost it and comment with the alt-text with the Alt4You hashtag.
That keeps Mastodon growing and provides services to the sight impaired users, AND it is a gentle and helpful way to remind people about alt-text without the harassment.
Again, it is about being part of the solution.