Default [Q] Can't see the internal sd card

Hello, someone gave me a myplay dea android tablet which barely worked, so I just wanted to take its "internal sd card" but after opening it I couldn't see it: can this "internal" sd card be 100% virtual and actually is part of a welded memory, or do I have to look further ?

And by the way, the first obvious question that came to my mind when I saw this and google didn't help me: what's the point for the manufacturer to put as sd card reader + a sd card inside a tablet, instead of a memory directly welded on the motherboard ? Wouldn't this be cheaper for them ? Thanks.