The way it's calculated is very simple. Every time a liquidity swap is completed it includes 1-5 channels. Each channel capacity is added to the total capacity opened. Therefore this is a historical total since the start: June 2021 (total 17 months).
Swaps have various expiration dates from 1m to years, and sometimes nodes may fail so the channels may close prematurely. Therefore 1,000 BTC doesn't mean that we currently have 1,000 BTC worth of channels opened on LN+.
Ok. Thanks for the confirmation and detailing message.
I reckon it's much less than 1000 BTC then. I closed all my channels, and I still often get messages in my swaps of other people (force-)closing channels. Also, many don't respect the 1 month to years commitment. Unlike amboss liquidity, i don't remember LN+ punishing someone for closing a channel before expiration commitment.
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