I split my time between Europe and China so I'm aware of the differences in that regard. My question was specifically regarding the comparison between European grapes and boba because I was struggling to identify any shared attributes from the varieties I have experienced. Is there a variety of grape which is more chewy in texture, perhaps?

I'm unclear why such a simple question appeared to offend at least one person.

That comment makes more sense if you read it as referring to popping boba [0] rather than the "normal" chewy tapioca boba. Grapes don't pop but the feel of the skin is similar enough.

[0] https://en.wikipedia.org/wiki/Popping_boba