Rising Star is really pretty good for a F2P P2E game.
As for Splinterlands 🤔, I don't think it really is possible to earn anything anymore with zero investment. But for a minimal sum spent on rental, I'd say it is possible to churn out a small ROI.
!PIZZA 🍕
If I like Rising Star a lot, as for Splinterlands I haven't tried it at all. since I'm pretty bad at card games haha