The folks at ZeroVM have a list of motivations[1] for this type of execution and hosting model. The only problem is that it's hard to tell how active the project is from their main page alone.
EDIT: Their github commit is fairly active for a solo developer[2].
EDIT: Their github commit is fairly active for a solo developer[2].
[1] http://zerovm.org/motivation/
[2] https://github.com/zerovm/zerovm/commits/master