Why do some Protestants divide the Blood of Christ into individual cups?

A [related question](https://christianity.stackexchange.com/questions/27259/why-dont-catholics-divide-the-blood-of-christ-into-individual-cups) asks about Catholic practice (of using a common cup). In some Protestant Churches — I’ve experienced this myself in both Baptist and Free Churches — the wine at the Communion service is poured into small glasses and distributed amongst the congregation. Everyone drinks their glass at the same time. The Biblical account tells us that Jesus used a single cup at the Last Supper. While it seems many Protestant Churches attach paramount importance to the Biblical account, why do they not follow suit in using a common cup?