All perfect praise be to Allah, The Lord of the worlds. I testify that there is none worthy of worship except Allah and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
When the unlawful things are mixed with lawful ones in a way that one can still benefit of what is lawful while avoiding what is unlawful, then that does not forbid benefiting from what is lawful. Therefore, there is no objection to benefiting from these websites while avoiding the forbidden things on them.
For more benefit, please refer to fatwa 334582.
Allah knows best.