To increase the attractiveness of smartphones, manufacturers put as many different programs on them as possible. This is clear. Just take and delete the unnecessary ... Stop.
It turns out that some programs cannot be removed. For example, on selected Samsung models unable to delete Facebook (there is only the 'disable' option). They say that the Samsung S9 also comes with Microsoft's "non-removable" apps preinstalled.
These smartphones are for example. The same problem with other models. Many have non-removable programs from the manufacturer itself.