There is really no catch other that there is no professional support (see.. for a slightly longer explanation http://1.ai/specs) and that we take no responsibility for your data (e.g. you should always keep a backup. this doesn't mean that we do not care about the service just we do not want to be liable if something goes wrong).
It is paid by myself and I do not need to make any money out of this - similar to the official mirror I am running for the PHP project. The service doesn't need ads/paid subscriptions but again it is not to be compared with a paid service as we do not provide professional support.
