Which deplatformings do you specifically refer to? The concern over them just seems way too tribal at the moment to be considered in league with the more serious allegations against Robinhood and the funds involved - that is big money.
Wrt Parler specifically, I think a lot of the "solutions" (or sketches toward) on this site would quickly reveal that the optimal societal configuration is closer to what we have now than one would expect - with or without S230.
Also, the wording of "using AWS" is almost libelously in need of a citation - who is doing it, and how do they have any sway over a company that is both absolutely enormous and not particularly woke?