who should not eat pineapple

Why should pineapples be soaked in salt water before eating?
many people often have the habit of soaking pineapple after adding it to salt water for a while before eating. so, what is the effect of soaking pineapple in salt water and how long should it be soaked?
Why does eating pineapple hurt the tongue? Who should not eat pineapple?
when eating pineapple, some people often have a burning tongue, making them worry about whether there is a problem with pineapple or health?