Going on an internship isn’t a free mess about. You get practical experience, bring skills you’d learned in the classroom to life, two people coming out of uni broadly level pegged going for the same job but one has had previous experience …. You’re not stupid enough to think that doesn’t make a difference.
If they said “we are excluding people who had a private education” from applying I’d at least see it as being a bit of a leveller even if I disagreed with it but they aren’t, they are excluding at least 75% of kids from applying.
I can only speak from my own experiences in life, I’ve never had owt given to me, grew up in a council house with ice on the inside of the windows in winter, shit state school, pretty average student, didn’t go to university but the one thing my parents could give me was a belief that if I worked hard and never gave in I’d do alright….and I have. It’s the one trait of mine I’m proud my kids have.