Do US universities use GPA according to transcript evaluation services or internal evaluation? I would like to know, if given both options, which of the options, would officials at the american universities follow?

By internal evaluation, my GPA at some of the universities is translated/scored as 2.87/4.00. Disbarring me from all of their programs.

By WES evaluation, my GPA is translated/scored as 3.25/4.00. This option allows me to run/apply for all the programs at the said universities.

Which of these evaluations would the university use?

Does WES's evaluation hold any weight?

Wouldn't this be a problem for those who are not aware of such services?
As far as I know, American universities do not rely on "transcript evaluation services"; they ask you to convert your GPA to whatever system they happen to use, since there are so many of them out there (5-point versus 4-point systems, A+/A/A- versus A/B/C, and so on).

You could of course provide the results of such an evaluation service, but I would not expect it to carry any weight with admissions committees, who can accept or ignore it as they please.