So you're playing play chip games and someone played poorly? lol
Btw, not sure what you're upset about, guy shipped it with bottom pair 7 kicker. I would pray to the poker gods and sacrifice chickens if it'd put people at my table that were beating me like that.
Anyway, I actually have experience via a prop bet race to 1,000,000 play money on FTP long ago. Everyone's playing basically all the time, your FE is quite close to actually 0.
Preflop, press big PP's to the max, I'd just jam JJ+ right away and adjust based on calling ranges.
Postflop, I'm looking to make 2pair+ and just ship it in. You'll win a lot this way.
Also, these games have 0 carryover to playing actual games where players are risking their money. The nuts and bolts of how the action goes, like SB acts first, or full house beats a flush are the same, but strategically it's just a whole other world.