These days many top performing video ads are the ones that are made to look amateur/cheap. And it's not just the guru course ads. The native vlogger-style ad is often more engaging on a platform filled with vloggers. High production value "professional" ads have traditionally been created to lend credibility & authority to the brand. But if their audience now trusts "influencers" more than big brands, what's the harm in testing a TON of simple video creatives with clever scripts.
I've even seen this style now in offline commercials.