Yup, you can definitely do it, and it is delicious, specially if you crush some ice cubes with it. You don't even need to worry about the pit, as you can just throw everything in the blender, and then sieve it out if you want. Tartness is high indeed, so sugar might be needed to balance it out if you have a sweet tooth

Now that you mention it, I do wonder if I could get a mead out of it too, but I have zero knowledge on meads. Compotes are doable and I liked them, but I actually prefer them in natura when in season

Bajan Cherry Juice is a popular drink in the Caribbean.

They are quite tart. I guess mixing with cashew juice would work well, as cashews are astringent.

You and me both.

They are quite common in Central and South America. I'm not sure how widespread they are elsewhere, but they are easy to grow and they aren't finicky at all

Not at all honestly, I've never seen anyone pooping their pants off after eating them. I actually got curious about it, but I was unable to find the scientific evidence of laxative effects from Malpighias

If I were to guess, all the fiber and food matrix helps slow down the absorption rate of the vit C, which prevents the laxative effects that you might have when you ingest those pills from the store