The unwanted apps are nuisance apps, if not outright harmful apps, such as:

After a review of the insidious apps that are loaded, I do not feel l can trust BLU with my data.

A TrendMicro app cleaned off most of the bad apps.

Upon activation and initial use, BLU mobile services (a marketing app made by Logia Group which develops mobile marketing solutions (according to Forbes) and was acquired by Mandalay Digital Group) downloads a bunch of extraneous apps onto the BLU phone

There are many useless apps installed that need to be deleted, but still, you need to install an SD card and configure it as an extension of the build in memory AND move all applications you possibly can to that card, in order for it to work decently

Beacon Flashlight (very invasive advertising app, possibly steals your data)

Right from first boot, I had to uninstall and disable numerous apps that were causing full-screen

A TrendMicro app cleaned off most of the bad apps.

You can uninstall or disable these apps

Take as much as 10 seconds or more to open an apps that was already running in the background, like FB