I have backlight compensation set, but there is quite a bit of difference.
The sun is rather bright in the "Hill Country."
I wear clip on sunglasses and some dark wrap around sunglasses at the same time. 
You cellphone camera is likely doing a lot of “dynamic range” enhancing operations before you see the image. Your webcam images have the same problem as some of my security camera images do.
In my “AI person detection” add-on for security cameras, for some cameras I do CLAHE on the zoomed detection of the person to improve the image that gets Emailed. Tests showed that CLAHE didn’t help in detection of a person, likely because the model training included a wide variety of light levels, but it definitely can help when a person looks at the image, so I do it for certain cameras before the detection image alert is Emailed .
You can learn a bit about CLAHE here: https://pyimagesearch.com/2021/02/01/opencv-histogram-equalization-and-adaptive-histogram-equalization-clahe/
Here is a sample before/after image lifted from the above article so you can see if it might be worth pursuing:
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Thanks.
I took a look at it.
It would be a lot of work to get it set up.
The only time I have problems with guvcview is when the sun is very bright.
I can live with it.
You might want to look at some video light-control utilities in order to limit the range of of lighting from brightest to darkest within a video image:
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Thanks Eric for your help.