So, there is no artists in, for example, street photography? Picture must be altered to become art, or staged?

Was it irony? :)

They are photographers. Here is the definition of an artist so you can have better clarity on what an artist is:

"A person who creates art (such as painting, sculpture, music, or writing) using conscious skill and creative imagination"

Your definition assumes that photography is not art and/or doesn't involve conscious skill and creative imagination. That's not the consensus, to put it mildly.

Everything is art then and we are all artists. Happy? Also consensus != correct.

I took gp as satire. But maybe not haha.