It's cathartic to feel that your views are correct but simply suppressed by the establishment. You don't simply have a political opinion, you are ultimately correct, and the true absolution of revolution will make your opinion manifest. My family is from a developing country so the particulars are different, but yes people don't just descend into violent revolution because they lose their jobs. Unemployment is indeed a factor in revolution but is one of many.

It's one of those unfortunate aspects of internet information silos where people repeat this phrase to each other but don't really contextualize their opinions in the greater body of history and political thought.

Additionally, I think a lot of people with this opinion don't realize the vast difference in material standards we have today and what was true in the age of Communist revolution and decolonialization. It's tempting to think of material standards as relative and I think inequality is indeed a destabilizing factor in socities, but minimum material standards are true in so much of the world today that I think a class-conscious revolution is much harder in most of the developed and developing world absent other external political forces (e.g. nationalism, decolonoialism, etc)