This is a bit misleading. A big advantage of an "Open Source Software" solution as opposed to a "Propriatary" solution is that you don't have to worry if the original provider goes bust or doesn't release patches or discontinues the product, and you don't have to worry about how many licences you have etc. i.e. Open Source gives you, not the people who made it, the power & control.
With cloud hosting, like Amazon S3, where you store all your data (or servers) on a 3rd party's servers, there are legitimate concerns about control & access (i.e. how much control do you have to do things, how much control do you have to stop someone else doing things (i.e. privacy)). So an "Open Source Alternative to S3" sounds like a good thing that would not have any of these drawbacks.
If someone thinks "Open Source S3" thinks that they, not the hosting company, have power & control, then they would be dissapointed by Nimbus.io, since it has all the drawbacks of S3.
With cloud hosting, like Amazon S3, where you store all your data (or servers) on a 3rd party's servers, there are legitimate concerns about control & access (i.e. how much control do you have to do things, how much control do you have to stop someone else doing things (i.e. privacy)). So an "Open Source Alternative to S3" sounds like a good thing that would not have any of these drawbacks.
If someone thinks "Open Source S3" thinks that they, not the hosting company, have power & control, then they would be dissapointed by Nimbus.io, since it has all the drawbacks of S3.