I certainly would not use stainless steel for anchor
chain. It will get seawater-wet, and it will pile up in the locker, and it will get de-oxygenated with chlorine around and it will crack like biscuit.
Be eternally suspicious of this stainless stuff.
The chrome in it is very reactive indeed. When there is oxygen around, the oxide passivates it and seals off the reaction, slowing it radically. When there is little oxygen around, and there is chlorine about, it forms chromium chloride and corrodes very quickly.
This is a classic mistake made with seawater tanks. They work for decades if there is a free surface and oxygen around. Put a cork in the tank, let it de-oxygenate, and the tank is wrecked in a matter of weeks.... laced full of cracks. It still looks OK. It just won't hold any water.
Make sure that your stainless water tanks are not filled to the brim, even if there is tap water in there. Let them breathe and let the water splash around in there to oxygenate it.
It looks pretty, but in the wrong conditions it will fail faster than any steel ever would.
Use it only when you have to, and warily.