Just to respond to the comments that Antec has ripped fractal designs cases off. When was the last time that Fractal released a case that served the needs of people who need lots of HDDs?
The Fractal R6 released in late 2017 and moved to an NZXT H440-style HDD mounting system, supporting six 3.5-inch drives at stock with the ability to support more with add-ons (which are really hard to buy now). The Fractal R5, released in early 2016, which supported eight 3.5-inch drives.
If Fractal isn't going to release something new for this niche it makes sense for somebody else to try. Fractal doesn't have a monopoly on the "lots of HDD space" case world. The Antec mounting system is also very different from what Fractal uses.