While I disagree with the travel ban, let's remember that the primary objection that the tech industry has to it is that it will disrupt the flow of cheap talent that it uses to boost its multi-billion dollar profits at the expense of US-educated engineers that would demand higher salaries and benefits. This group of companies may not garner much sympathy.
I don't know where you get your information, but at the kind of top-tier tech companies that are being discussed here, H1B employees are not getting inferior benefits. And as someone that does a lot of hiring I can guarantee you that the interviewing costs, relocation costs, and language barrier trade-offs do not make up for any salary differences that may or may not occur. We're not talking about some low-tech banks…
Having dealt with senior executives at more than one of the companies on the list, I can tell you that my cynicism is justified. With regard to the rest of your comment, many of these companies do an end run by hiring consulting firms that abuse the H-1B system as a business model, some abuse it directly, and some actually use the system as intended. But to imply that virtually no abuse is occurring is absurd.