Marketing is very important in this case.. Some body makeup products can also be used as self tanner.Black women do sometimes wear fake tan for a more even look/skin tone, I’ve seen some (very few) Black influencers mention this
I've used Vita Liberata's Body Blur as body makeup as that's how it's advertised. The campaigns show a variety of different women of different complexions (including deeper/black skin tones) therefore I feel comfortable using it as body makeup for me (I'm black by the way) to cover up scars on my legs. If you're of a lighter skin tone, it might also be a suitable self tanner.
I will not, however, buy something that is specifically branded a tanning product. There needs to be effort made in product development and marketing for me to even consider it. Hope this makes sense.