(Blue, Red, probably Green) Dot powder

When I was a kid, it it seems like we could load literally EVERYTHING with Red Dot and 4756- shot, brass… everything.

I don’t really need these powders, but just wondering…

Why is the 4756 gone?

Why can’t I find Blue Dot?

Why is Red Dot so scarce?
(Midway USA appears to have 1lb bottles, but I haven’t bought anything from Midway since Larry pledged his undying love for Wayne LaPierre)

I can get any factory ammo, and primers and many powders and bullets… but why are some components still so scarce?

Many powders have been discontinued, don't know if that's the case with the dots, but I'm pretty sure it is with 4756.
The wars, especially Ukraine/Russia have had the powder mfgrs busy producing powders for military small arms as well.