Regarding Scaleway lack of rDNS for IPv6: it's because they don't support it. Customers (like I was) asked for it many times since 2016 but it seems too hard to implement for them.
Unexpected outages, disk corruption, and usually not even a credit when I'd been up and down for days. If you have problems like that with your infrastructure and they crop up on and off for years, you need to bring in new people and invest in infrastructure. They aren't going to.