It’s also a bit misleading in the context that the StudyTubers use it. Saying ‘first in the family to go to uni’ is used a lazy shorthand for coming from a background with some kind of economic or social deprivation, but there’s nuance to that and a lot of people using this term are doing so to claim some kind of struggle that isn’t theirs.It's worth noting that back in the day, like up until the 80's, going to university was a status symbol, and it was remarkable to be the first one in the family to get a university degree, and that's because having one pretty much guaranteed you'd have a better life than your parents who didn't go to uni. So having a child go to uni when nobody else ever did in the family was essentially a step up the social ladder for the whole family.
But since then things have changed. Now having a university degree does not equal having a well-paid, prestigious job and being better off than people without a university education. I see it even with my own parents (who started working in the 90's): my dad didn't go to uni, my mum did (and she was the first in her family as well), yet he makes quite a bit more than her and his position is more advanced.
So basically nowadays being the first person to go to uni in your family doesn't have quite the same meaning as it did, and doesn't necessarily mean you're less privileged than people who come from a more academic-oriented background.
ETA: it can still be very meaningful, of course, depending on the circumstances; for some people it really does mean they had everything against them and still managed to get a university degree despite the odds and the lack of financial/emotional support from their family, and that should absolutely be celebrated for the huge achievement it is. That's obviously not the case with Ruby.
It absolutely used to be much less common for people, especially people from working class backgrounds, to go to uni. However, this phrase ignores the fact that for many careers that now need a degree, the training used to be provided by employers so you didn’t need to go to uni - in England, something like nursing is an obvious example. Now, it’s a career that needs a degree. Previously, you could leave school at 16, become a nursing cadet and end up equally as qualified as a nurse today with a degree (and be paid for training …) There also used to be long tradition of working class people being able to access higher education thorough the polytechnical colleges (most of which were made into universities in the post 1992 expansion of HE). My brother was ‘the first in the family to go to uni’ but my grandfather had the equivalent of a master’s level education in electrical engineering, all gained through a polytechnic - and he had the career and financial benefits from that.
I’m not saying this to discredit people who genuinely are the first in their families to access any kind of further or higher education but this is totally not the struggle of wealthy, solidly middle-class grammar school and privately educated kids - to be where they are usually means their families have been benefitting from education and training for a long time, however you want to classify it. And don’t get me started on people who don’t understand that whilst yes, both grammar and comprehensive schools are both state funded, there are so many social issues that mean that they are generally not comparable in terms of intake that they shouldn’t both be regarded in the same way. Jade has done that and it’s annoys me.