Does absolving oneself of the sin of publishing women's pictures in a public forum negate the sin for the forum owner?

You must control the forum by preventing images of women and violations of Sharia (definition) and ethical principles. If you cannot control it, and it is feared that corrupt individuals will use it for unlawful purposes, then we advise you to utilize your energy, activity, and wealth in what benefits the Muslim community in this world and the hereafter, such as creating a program for memorizing the Quran or teaching people matters of their religion.