It’s marketed as a secure messenger. People using it casually for non-secure things may be mislead to believe by their marketing communications that it’s safe to use, when it isn’t. Its use should be discouraged in all cases as a result.
People are using for many things. Channels and groups are two main features that other IM's either do not have or have nothing but poor substitutes.
>it’s safe to use
It is safe to use. As safe as any other method as long as you are not stupid enough to share sensible information. Using any IM for this task is a stupid move to begin with.
>Its use should be discouraged in all cases as a result.
This is like saying that kitchen knife usage should be discouraged in all cases. You can hurt or kill yourself or an other person.
