most of the worlds slaves live in 4 combined countries i believe. India, Pakistan, Bangladesh and China. but that's largely due to population size of the nations. by contrast the nations with the highest percent of their population in slavery are all either arab or arab-adjacent nations. keeping in mind of course that indentured servitude that is not life-long has been included in today's slavery stats, which stands out somewhat at least from historical chattel slavery. so many places like Saudi and other nations will take in foreign people to work as house servants for a period of time, then they can renew or be deported. not defending this as not slavery, just good context.
Slavery in every era has always been relative
the spectrum from tenant farmer to sharecropper to indentured servant to house slave to being whipped in the cotton fields.
Marcus Tullius Tiro wasn't just Cicero's slave, he was his close friend and secretary and copyist and a publisher and biographer in his own right
There's a lot of foreign workers in arab states that would definitely qualify as slaves under most modern interpretations if not strict quranic law