That's because it's not only poorly marketed but also a completely awful idea. It's 8-minute shows, chunks so small that it's hard to get invested because a full season can be less than a feature-length movie but has the ambitions of one. Some episodes are actually less than 8 minutes, most show concepts are horrid (they relaunched Punk'd!) and the people at the helm are... unusual.

This interview gives great insight into the mess it is: https://www.vulture.com/2020/07/is-anyone-watching-quibi.htm...

My favorite quote from that: "When I ask Whitman what TV shows she watches, she responds, “I’m not sure I’d classify myself as an entertainment enthusiast.”"