Why does it seem that everyone has the H Pylori bacteria, which causes ulcers?

Here is a source. It says the following,
“H. pylori is commonly transmitted person-to-person by saliva. The bacteria can also be spread by fecal contamination of food or water. In developing countries, a combination of untreated water, crowded conditions, and poor hygiene contributes to higher H. pylori prevalence. Most people become infected as children, and parents and siblings seem to play a primary role in transmission.”

It enters through the mouth is the main thing

https://kidshealth.org/en/parents/h-pylori.html

Transmission is fecal-oral.