There is a large discrepency between merchants that accept on-chain vs Lightning vs Liquid, etc are in practice very different even though they are all Bitcoin. The last two are extremely small and don't share the adoption of on-chain Bitcoin. Monero has arguably more adoption than Lightning, and definitely more than Liquid.

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My point is that a sidechain would have to start merchant adoption all over again from scatch. Compared to the last two attempts seems like a very tough uphill battle to get over the already existing network effect of the already existing privacy coin (Monero).