We plan to implement a decentralized storage at Callisto Network. I was researching SWARM for long enough. I like its main idea, but it has some problems that could not be solved: for example an issue of microtransactions. There is no solution for this problem unless you have free transactions. And transactions are not free at Callisto.
Explain, please .

What is not clear here? Refused from one way to solve the problem in favor of another. Or are you interested in what SWARM is?