At the moment? No. But possibly in the future.
Back in January, the Quibi website was replaced with a splash page for the Roku Channel, and a linked blog post there (dated January 8, 2021) announces that Roku is finalizing plans to bring Quibi content to their streaming service this year.
They don't mention The Princess Bride directly, so it's unclear whether it will be one of the Quibi properties that ends up on Roku, but it's at least an encouraging sign.
