Often used to describe non-mobile games that have similarities with actual mobile games (such as Clash of Clans, Farmville etc) such as
pay-to-win, loot-boxes,
timers, large or over-simplified user-interfaces, trade gameplay for
accessibility or have just otherwise sold-out to make the most possible money with the least amount of effort.
I
logged into World of Warcraft yesterday to play
Shadowlands, it is basically a mobile game now.
Yeah RuneScape is a mobile game now too, I'm going to play
Old School RuneScape instead.