I wonder if this has to do with the current economy and job market. Anecdotally I have found it very tough to find a new job (software engineering), though my previous employer continues to post job listings for green card applications as part of the required labor market test.
They certainly aren’t doing this out of any particular love for American workers.
I'd say it's on the Trump administration being full of racists and white nationalists and wanting to deport immigrants.
Why do you wonder if it's economic instead of the Trump administration's announced policies of stopping immigration, including unconstitutionally removing birthright citizenship?
Are you... genuinely this naive and ignorant to what's happening in USA?
They are not connected - this is a pause on immigrant visas, not work visas.