I still remember the golden years of Xtube between 2013 and 2018. Many Japanese crossdressers and crossplayers had migrated there because the first most popular amateur porn video site in Japan during the 2010s, "video dot fc2 dot com", doxxed and prosecuted some users (I don't remember If it was due to lack of censorship or to confirm that they were not minors)
On the other hand, Xtube allowed uploading freely and without the need for censorship. Nowadays most amateur Japanese traps use Twitter, Xvideos or Pornhub.