Earlier quoted context omitted.
Farming is the big one - if your job sucked too hard you’d just go back to being a subsistence farmer like most everyone else.
Was arable land easy to come by for a poor Roman or would you be more likely to have a landlord requiring some cut?
In general no, it wasn't easy for poor folks to get their own farm land, and it became harder as time went on.
A plot of land was a common millitary pension; soldiers would retire there and work the land after putting in enough service time. This worked well while there was plenty of decent land in Italy, but became a worse deal over time. Once the prime land was taken up soldiers had to settle for plots of varying quality far from their homeland, which was much less pleasant as you'd expect.