I think "proof of invite" can be a big thing. Like proof of brain.
People can control each other for onboarding and vote for those who onboard the most. In the best case, dapps have the tokenomics behinds to reward onboarder.
Would rewards efforts for offchain work. This is something we don't reward in any way at the moment.
In a perfect world, onboarding work would make enough cash for onboarder worth the work. So the onboarding process would become way way more professional (included smart campaigns with ads).
In the end, everyone would profit from it.