That's too bad. I used Scoot a lot back in 2012 before they even had one way trips. The biggest issue back then was also lack of availability near the Caltrain. I get the distinct impression that's going to be the achilles heal of the entire "last mile" effort in SF.
I'd be interested in learning if anybody takes the BART into SF and then uses Scoot or something similar. I imagine that would be more successful since there are many more stops downtown.
in my case, I cannot sign up to Scoot because I do not have a driver license. Theoretically I can't ride skip either, but they accepted a picture of my passport so it works.