Resource credits limit spam, and flags eradicate incentives to spam, as they were intended. Onboarding wasn't a problem in 2017, but the unrestrained taxation and resulting censorship that dislodged >1m users since then is the main impediment to onboarding today. Since those problems remain, onboarding will continue to be inadequate.
No one knows spam better than Marky. However, using tools designed to prevent crimes to encourage pro-social actions is dysfunctional from the get go, and will never work. Punitive taxation and elimination of economic rewards is nominal to prevent spam, scams, and plagiarism, but when applied to attain other purposes just censors and drives away new users, and this is what has happened since 2017 on Hive.