It's not the same low end. The point of my earlier comment was, if Nvidia's smallest card was the 5090 mobile making it the lowest end Nvidia GPU, would you still compare that to the base M5? Of course not, or at least I hope not? I hope that highlights the silliness of the logic at play here.
Now I did say earlier that Nvidia doesn't make anything comparable to the M5 GPU, but that's not entirely true. It does make the T239 SOC for the Switch 2. I would argue that's not really fair to Nvidia as that's technically an older GPU design (sort of, my understanding it's a hybrid Ampere with extra features), but that's the closest thing they currently make and was released just a few months ago. So if you want to compare Nvidia's low end to Apple's low end, by all means compare the Switch 2 to the M5 as that is technically Nvidia's lowest gaming solution, not the 5050.
There is talk of Nvidia and Mediatek releasing PC chips later this year/early next year, but we don't have confirmation on what kind of chips. If the rumors are accurate, the smaller of the two might, might be base M-comparable and we'll get an actual Nvidia GPU to compare to the base M. Until then, you've got AMD Strix Point, Intel Lunar/Panther Lake, Qualcomm Snapdragon Elite, and I suppose the Switch 2 if you really want something from Nvidia.