After I was done with this post, whenever I tried to do a speedtest, it would never actually go higher than 900mbit/s
I went back to a previous system restore point, before EA App, and now my internet speed is back at 2000 mbit/s.
EA App and game download were the only factors in this, as I've reverted all the changes people on this forum and elsewhere suggested.
So not only does the EA App throttle your internet speed during a download, it somehow also affects it afterwards.
The setting for "unlimited" works as intended, it's just they somehow take control of your internet and reduce the speed so the unlimited is not a whole lot.
After I finished with the restore point, I never again intend to install the EA App or play any games associated to it.
This requires proper investigation.