Then why did it not kill either Kylo or Rey?
In the scene jarbear is talking about during their first force connection, Kylo says to Rey: “You’re not doing this, the effort would kill you.”
Later, in the Throne Room, Snoke says: “It was I who bridged you’re minds.”
I’m not sure how this applies to TROS. I guess Palpatine continued their mind-link?
I see… but why did it not kill Snoke?
On the subject of Palpatine, the final interaction between Rey and Kylo in The Last Jedi before the Falcon got off of Crait implied that the Force mind link is permanent after Snoke’s death.