I'm not entirely sure there's much else to explore about his past. He was a janitor on Starkiller Base. Ok?
It is clear you do not know the history of casting black people in demeaning stereotyped roles of that kind (bumbling janitors / butlers, chauffeurs, etc.) throughout the entire history of film, and why this treatment of the Finn character was criticized by innumerable black audience members. There was no justified reason to have the one black lead be a janitor, which further reduced Finn to comedy relief, when the story of a Stormtrooper breaking free and reclaiming his once-lost identity would have been a superior plot and believable, personal motive for Finn to fight the First Order.
It's not up to YouTubers to say what a story "should" have been about. You either like the story or you don't.
By your criteria, one can say its not up to you to tell others that they do not have a right to an opinion about anything. The ST is not above criticism, especially deserved criticism.
Poe was almost entirely sidelined in TROS, but I don't hear Oscar Isaac complaining
Posted like someone utterly ignorant of the position and mistreatment black actors have faced in the entertainment industry. Isaac will never face the hurdles Boyega will in his career, not only with Western audiences, but in foreign markets still hostile the image and idea of black actors (which Boyega pointed out in the marketing of the ST). There's no denying that.
Han barely had anything to do in Return of the Jedi but you never hear that mentioned. And the OT had a tiny fraction of the characters the ST does.
Solo was a principal character who was the motivation for the first act of the entire film. He was also completing his romance arc with Leia. To even compare the handling of Solo in ROTJ to Finn in the entire ST is either being obtuse or deliberately dismissive of the sociopolitical issues Boyega and others clearly witnessed with the Finn matter.
The YouTube video created a far better, more authentic-feeling Star Wars story than the "creatives" behind the Sequel Trilogy.