Yeah that’s exactly it. With lay bets, you’re acting like the bookmaker yourself — saying “this won’t happen.” Only exchanges offer this because they match you with someone else who's betting for that outcome. Bookies can’t really offer lay bets because their whole model depends on being the house. If you want to wrap your head around how it works,
https://sportsdigest.in/betting-exchange-vs-traditional-bookmaker/146750/ breaks it down pretty well. I use lay bets a lot when I want to hedge or do matched betting. It’s a cool tool once you get the hang of it.