The difference you mention is the word "then."

In a passive effect, anything before the word "then" will initiate regardless of targets, etc. Anything after the word "then" requires everything before the word "then" to resolve successfully. So while "when revealed, each player chooses and…" will always initiate (requiring everyone to do as much as they can), unless every player is able to do so, it will not resolve successfully - (despite initiating successfully). If it doesn't resolve successfully, the part after the word "then" will not initiate at all.

So you are effectively asking me to make a list of all plots with the word "then" for you.