> you have to be a chump to pay for a Slack IRC bridge
Or part of a network that doesn't want to issue generic API tokens to random users. Since this irccloud is implemented as a specific app integration, if I understand correctly this would be more appealing to administrators and moderators.
Matterbridge seems interesting as well but I haven't had time to play with it yet. https://github.com/42wim/matterbridge
In view of those more-complete, non-proprietary solutions, you have to be a chump to pay for a Slack IRC bridge.