Generally speaking, in cases where a cloud provider might go out of business, any lifetime cloud storage plans which are in operation will almost certainly cease to function any longer from this point onwards (and it is important to be aware of this as a possibility when purchasing such plans). Having said this, it is always possible that such a failing cloud storage provider might actually be bought by another company before failing and, whilst there are no guarantees here, this new owner might choose to continue honouring the lifetime plans meaning all might not be lost!