Like "shouldn't have been pumped from the ground in the first place" -- what? (also ignoring that historically oil was discovered literally just coming up out of the ground on it's own).
The article you linked specifically states that this was previously thought to be true, but is not.
It does however point out that per-capita ocean plastic polluters are not evenly geographically distributed.
Because the key bit of data there is that ocean-borne plastic is not primarily coming from beaches, or city storm run-off (at least in modernized areas) in an even distribution but is very obviously a product of local regulation (and in turn suggests that other measures - like foreign aid or imposing standards of behavior on local companies with foreign suppliers/subsidiaries would likely solve the problem).
The issue is no one's truly freed themselves from the "individual sacrifice" narrative of environmental remediation: the desire is to accuse people on an individual basis of ruining the world, and requiring all solutions to involve individual consequences for their "sins". There's much less enthusiasm for the reality, which is that other then some slight changes in tax allocation we might be able to just solve the entire problem and give a slightly improved standard of living anyway (i.e. people in wealthier cities generally like their waterways and beaches not to be clogged with trash).
Another thing that radically changed my mind about ocean plastics is that most all of it comes from a handful of rivers. The solution to ocean plastics isn't to eliminate or recycle all plastics, or even to filter it out of the oceans. Rather, we just have to to stop a small handful of countries from dumping garbage into their own rivers.
https://ourworldindata.org/ocean-plastics