I had one planned maintenance disruption using their API for a few minutes as well as about 30minutes disruption yesterday solely with their API. I told them about the latter via Twitter. I am not sure if they found this error themselves or if my Twitter post helped them. The status/incident-ticket page was updated after my Twitter post. I don't know how much of these 30 minutes was fixing the issue or just discovering my Tweet. Once they contacted me on Twitter it was fixed in < 5 minutes.
https://www.reddit.com/r/webhosting/comments/55kiqc/be_aware...
https://www.reddit.com/r/webdev/comments/50thne/scaleway_ste...
Can anyone tell how reliable they are?