You make very valid points here @hanggggbeeee. It's not easy to become seen among so many "voices" so people often resort to "trickery"because they become impatient.
Unfortunately, it seems like this will always be a debate between people who are "only here for the money" and people who genuinely care about the content and are here because Steemit is a social content platform.
Greed doesn't work, especially in the long term. Perhaps one of the nice things about Steemit is that it seems almost "self-regulating:" The people who care about content continue forward and make connections and slowly gain a following. Meanwhile, the spammers end up getting angry and give up after a while, especially if they put their garbage on the wrong dolphin/whale's post and get flagged.