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You can kinda enforce it but simply removing the Like button on the UI of the clients. That's what i mean with:
Nostr clients should consider
0 sats \ 1 reply \ @k00b 2 Mar
Clients that allow people to react for free will have an advantage then because most people don’t want to zap. I’d guess 1% of 1% are by nature alone generous
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What sets stacker.news apart is its unique approach of using zaps instead of likes or upvotes. Without forcing zaps, there will be no change. Once zapping becomes the primary method of interaction on Nostr, people will start to participate, even with just 1 sat zaps.