As many others here said, the struggle of making ends meet right now doesn't take precedence over the safety of others. Nothing about this drivers situation necessitates being a genuine threat to others on the road. Besides, I'd suspect that whatever service he works for doesn't care enough to fire him over your report. Likeliest case, nothing comes from it until multiple reports, and even then it's probably a slap on the wrist. Even if consistent behaviour leads to him being let go, he just swaps to a different, underpaid crime of a service.

And consider, what is the best and worst case for choosing to say something or do nothing? Best case scenario for speaking up, either a verbal reprimand or being forced to swap to a different company results in him reconsidering the way he drives. Worst case, it forces him out of the business altogether and he's off the road. Meanwhile, if you choose to do nothing, the best case is he continues to drive without issue, and the worst case is someone literally dies.