Tipping is done with money.
In the USA bitcoin is not considered money.
Zapping on nostr is gifting, legally speaking.
And every US Citizen has $13,610,000 lifetime gift tax exception limit. The more ya know...
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13 k per gifter per year i believe. Thats why people who receive large sums of money from "go fund me" or "gift send go" dont have to pay any taxes. As long as no one person donats more than 13 k the entire sum is tax free.