I think the language you just used answered your own question: “manage to get”. Those platforms, with likes and retweets, boosts (and to some degree, Karma) are competitive, everyone vying for increased following. Some might follow, comment, retweet or boost genuinely. Most are, at least subconsciously, looking to expand their personal influence.
That attitude obviously also exists here, but it’s tempered by the lack of an endgame. It’s harder to become Internet famous without a scorecard.