Maybe just because it's fun to pick on the new kid...
The difference is Facebook & Twitter take their content moderation (and it's overall impact on their business) very seriously.
From any angle you look at this, Parler failed at reasonably moderating their content. More so, at their own peril despite being warned by AWS about the violent content.
And by employing volunteer moderators, it reinforced the echo chamber effect, suppressing any views or opinions diverging from the mostly far-right user base.
The difference is Facebook & Twitter take their content moderation (and it's overall impact on their business) very seriously.
From any angle you look at this, Parler failed at reasonably moderating their content. More so, at their own peril despite being warned by AWS about the violent content.