The comparisons to other providers is off base because either other providers are cooperating more when they possess actionable, unencrypted information and taking steps to detect or prevent such recurrences or they are like Signal and do not have access to the underlying material in the first place or store it for very long anyway.
One cannot legally run a hosted, unmoderated content platform in the developed world, one will always be required to remove illegal materials and turn over materials in cooperation with law enforcement.