The debate about executive orders is a long and intricate one, and I personally believe that over the years both parties (when in power) have expanded executive power too far. There is obviously a reason to allow executive orders, i.e. when something needs to be done quickly in an emergency. Whether the COVID-19 outbreak was/is an emergency is of course debatable. However, I feel it was/is far more of an emergency than Twitter’s ability to respond to tweets on its platform.
What you have to remember is that all the executive power Trump normalizes can and will be used by the other party when in power. I see these as very short-term wins for the Republican party that generally weaken the checks and balances our government depends on to be a democracy.