Are you saying that Google down-ranked them in search engine rankings for user behaviour in AdWords? Isn't that an abuse of monopoly? It still surprises me a little bit.
Any sentiment expressed by the party which has dedicated itself to unrestricted corporate rights in this direction is an insincere attempt to pander to a current culture war front they are fighting that week; In this case, likely something along the lines of 'Twitter censored Trump's hydroxychloroquine post - we MUST PUNISH THEM AND REIGN IN BIG TECH [for not contributing to the fascist project]'.
EDIT: Direct quote - "The internet's hall monitors out in Silicon Valley, they think they can suppress us, discourage us. Maybe if you're just a little less patriotic. Maybe if you just conform to their way of thinking a little more, then you'll be allowed to participate in the digital world,"
This isn't an attempt to ensure freedom from monopoly, this is an attempt to enforce partisan control of the message, weaponizing the idea of free speech using force.
I can assert that the 'common public square' idea central to freedom of speech is disappearing, and that this is a bad thing, but that's not what this man has been arguing or why this man has chosen this issue.
if you believe their words (and I can't blame anyone who doesn't) apparently they want to lighten regulations on everything except big tech. So there may be a chance all those Google/Amazon cases will keep going on into the Trump administration.
To be clear this isn't because they have a problem with monopoly businesses abusing consumers. It's because big tech exercised their First Amendment rights in ways he found undesirable.