Ok understood
Not really. Cause anyone can publish zap receipts without zaps even being sent. That’s what nostr:npub1u8lnhlw5usp3t9vmpz60ejpyt649z33hu82wc2hpv6m5xdqmuxhs46turz was trying to explain.
Discussion
I think the only way to estimate the number is to tally up the numbers from zap receipts published by trusted custodial lnurl services.