Look at the data here: https://h1bdata.info/topcompanies.php
Don't be alarmed if you don't recognize a good portion of the top companies because they're Indian IT outsourcing/consulting companies that logjam the whole system.
There really isn't that big of a problem with H1Bs. It's a great way for companies to hire additional talent and to keep students that come here for graduate school inside the country where we subsidized their education.
I think we should focus on fixing the abuse first, then lets see where we stabilize, and then do further restrictions. It's too aggressive to curtail legitimate uses of H1B when it's clear that it's being so blatantly abused.