That would be impossible to enforce. There's no way to tell if someone else is logging in to an account to complete these tasks. IPs tell you nothing useful due to VPNs or Tor. This could also be done by relaying the questions to the third party over a platform such as Telegram or Discord, so bypassing the account login altogether.

I wouldn't be against having to prove some basic bitcoin knowledge in addition to earning merit in order to rank up from newbie, but providing it as an alternate route to ranking up (i.e. bypassing merit) is too open to abuse.

At some point in the past I believed quiz type floodgates may be useful at some (early) stage. I probably though so when the forum was thriving with spam (even after the Merit System was set in motion), but interesting as it may seem subjectively, objectively it seems:

- Easily cheatable: There can only be so many questions to a Quiz on a given topic. Even if you randomize the questions, eventually the will end-up in an external document or database (by crowd-reporting of the questions) and made accessible to all, defeating the purpose.

- The idea of a forum having mandatory quizzes taken at some point seems like an overkill. One thing is taking a quiz for fun, but another is having to do it at some stage/s as part of the procedure to participate in the forum.