I’ve had this happen only twice since they added the option to leave the squad, once for a tricap and once for profit taker...
The host waited for the hydrolysis to get the capture sound “ping” and then hit leave squad. It wasn’t just a disconnect because he “lol’d” when we sent him a message asking why he did that. The first lure did pop but with no arcane or shards and the other two just sat there with the blue symbol showing they are charged. We did receive the arcanes and shards from the first to eidolons so it wasn’t a total loss.
On the profit taker the host left the squad just before you grab the loot after the spider goes down and by the time we loaded back in the profit taker already exploded. He was standing in Fortuna by the elevator running in circles to get our attention.
So, yes some people will and can do it on purpose to be jerks, but out of the other 60 profit taker runs and countless tricaps, it hasn’t happened since. And plenty of those have been random pubs and recruit chat. Buttholes are always going to be buttholes.