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Multiple media companies removed President Trump's accounts.
Based on the Presidential Records Act (PRA) of 1978, we, the people own presidential communications.
In the court case 18‐1691‐cv Knight First Amendment Institute, et al v. Donald J. Trump, et al it was determined that:
"We do conclude, however, that the First Amendment does not permit a public official who utilizes a social media account for all manner of official purposes to exclude persons from an otherwise‐open online dialogue because they expressed views with which the official disagrees."
From this determination it can be surmised that Trump's Tweets are considered "official purposes" and must be documented for storage in the National Archives based on the PRA.
These corporations have taken this "official purpose" offline at their own discretion.
Citizens can sue these corporations as the CEOs have deemed themselves owners and moderators of this information when it is We, the People who have true ownership.
I recall hearing that Class Action lawsuits are very effective. I have initiated the process.