Replying to https://twitter.com/ROWEBOT3339/status/1730685419660960133:
@ROWEBOT3339 1. Custody of a channel is held by both channel partners in 2 of 2 multisig.
2. Cost varies according to base-chain fee rates at the time, and the number of inputs used to open the channel.
3. Infinite.
4. Yes and yes.