One big online platform that has totally skimped on reasonable moderation is the charmingly named "E-Mail".
Child porn, copyright infringement, harassment, hate speech, spam, you name it. Anything goes. It's a complete free-for-all.
Giant internet companies like Google and Microsoft make billions of dollars a year through their partnerships with the E-Mail platform. These big companies do make a token effort to remove objectionable content from their servers, but that doesn't matter.
Anyone who wants to sidestep this reasonable moderation and spread hateful content on E-Mail can easily do so for a few dollars a month by setting up a darkweb technology known as a "Self-Hosted Mail-Server". Underground terrorist collectives such as the "postfix" organization distribute software making it possible to set up a Self-Hosted Mail-Server in a few clicks.
We need to rise up and pressure these billionaire tech companies to stop connecting to any E-Mail providers that do not have a full content council and policy, and a team of content moderators.