Interesting comment and felt like I was supposed to find this! My team is actually working on something along those lines so companies can directly embed a "demo-able" version of their product whether its on their website, sales outreach, or share through emails without opening up their actual product to everyone.
Check us out (still in beta but I want to practice what I preach and get my own product on our page once its a bit more polished): https://www.getlancey.com/
https://www.ycombinator.com/companies/magnetic/jobs/77FvOwO-...