A rainbow stretching more than its normal parameters

Actually, you can sometimes see small rainbows that are full circles

Rainbow forgot how to rainbow.

Rainbows are always like that. Go in a plane while looking at a rainbow, you'll see. They also follow you because they are based on your vision, everyone sees their own rainbow because it's your own eyes reacting to the sun light refracting off water droplets.

It's the circle of liiiiiggghhht

Is that Victoria falls?

There is no pot of gold at the end of a rainbow because there is no end to the rainbow.