I have reported videos that people share that includes sexual acts, gun violence (with deaths), gang executions and bloody traffic accidents, and I think Facebook removes around 10% of what I report, the rest continues to live on their platform.

However, my friend who takes model pictures (some (most) with not a lot of clothes on) have received month long bans for not covering up nipples correctly, here is some of his shots: https://www.instagram.com/tonnynathanfoto/, it is interesting how a bit of nipple can result in a month long ban, but someone executing another person on camera is just fine.