Okay I can probably explain it here, so:
During Minecraft version 1.12.2 there was a mod called Kidnap.
It mainly dealt in adding ways to hinder other players (as one might expect from the name) in terms of how they could move around, what they could interact with, and to an extent even how they were able to use ingame chat. But for game balance, and in a stroke of genius game design, everything you could do to someone else, they could oppose, even without specialised tools. They could struggle out of being tied up, they could pick the locks on their manacles, so on and so forth. This meant that despite the mod giving you ample ways to debilitate your fellow Steve, they always had some way to respond to it.
Additionally, you could counter-act their escape efforts by checking up on their restraints regularly, which created a kind of emergent mind-game mechanic as abductees tried to outwit their captors and escape (or just wait for them to log off). The captor in turn had to stick around to ensure their prey didn't disappear from under their nose. The restraints were also very rarely absolute, even gagged you could type gibberish into chat.
If you haven't yet spotted the problem here, well... Kidnap was a BDSM fetish mod, and it did NOTHING to hide that fact. The basic rope binding was straight-up fetish knots, there was a variety of ball gags to use, there was even blatant slave/domme mechanics you could enact on your captives.
Mojang quite swiftly caught wind of this, and in a move unheard of before or since they stepped in and forced the one-man mod team for Kidnap to pull it offline in very short order. Almost overnight the mod became vaporware, nowadays even the wiki is barely visible on Archive.org, and it took me a good while even to identify the screen name of the author. From what I gather, Mojang were so intimidating that they deleted the source and basically quit modding altogether after that.
There's basically nowhere to find Kidnap in a downloadable form, though there are copies floating around outside the anglosphere and foreign language mod showcases for it still pop up on YouTube occasionally. As they say, nothing ever quite leaves the Internet.
At time of writing Minecraft is marching towards version 1.21, and in the intervening time absolutely no mod has ever come close to replicating the game design elegance that Kidnap did. For a lot of projects, it continues to be a tough question of how to impede players without utterly spoiling their play experience. Most of the time it's either done with status effects that can't be meaningfully opposed or by keeping the stats low or just giving up all pretense and hosing the unfortunate recipient.
But in a kind of Streisand Effect, Mojang stepping in to squash one brilliant mod with a proud and upfront adult thematic did more for it than the author likely ever could: It created a legend.
