you are totally wrong about dust on steemit
your definition above for dust is totally wrong

dust is a new term operated by steemit cooperation to remove the posts's rewards less than 0.024 steem into the pool and be burned there to keep the price of the steem higher than the inflation might happen.

so my friend, if for any reason , your post, or comment has a reward less than 0.024 steem, then it will be after 7 days for the posting date ZERO REWARD.

HOW TO ESTIMATE YOUR DUST FROM NON DUST ? well, there is 2 options , simple one to do it by yourself and calculate each post or, using the steem world calcy=ulator for posts under dust.

how to avoid dust ?
increase the votes values in the rewards to value higher than 0.025 steem by bots, friends, buy more sp, etc
i hope that this correction will help you and others...

your post is being upvoted and resteemed

thank you