Bloodborne popularized that style, so yes Bloodborne is the inspiration for a lot of it's use today.
We can't say for sure what exactly motivated these designs, but Bloodborne is a safe bet since it's the most recent and popular facsimile.
I wouldn't say it popularized it. It is a common styling with pretty much any vampire type setting. It is perhaps the most recent, but to even remotely say that something is inspired by what is quite a common design trope for "dark" characters and settings is stretching it.
We can see this style in Van Helsing movie (2004) and I'm pretty sure we can find something even older. It is somehow some kind of "victorian dark cowboy", just replace the weapon and dye in black/dark grey.
You better put some respect on Castlevania's name boah.
It reminds me alot of the playstyle of the Reaper from Gw2 (necromancer side-profession)
They had a spectral skill that gave them a scythe & could use a giant Lich (turn into)