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 I believe it’s because people started testing runes on testnet, then started selling testnet runes and testnet-Bitcoin. So attacking the chain was a fairly effective but coarse way to stop that.

A testnet reset is being discussed on the mailing list (testnet4) but a reset has not happened for ages so opinions  are mixed so there’s not currently consensus on what exactly to do 
 interestinggg, thank you very much for the context sir🫡 
 There is also signet, which is a different testnet that works more like Liquid where blocks aren’t mined by hashing, instead they’re just signed by a set of known keys. Mutinynet is another signet.

Arguably signet is better for testing Lightning as the blocks are more predictable and shenanigans like Lopp’s attack can’t happen - testnet is useful for testing anything that needs the chain to behave more like actual Bitcoin (mining software, ASICs, reorgs etc) 
 was actually trying to check the difference the other day😂, really appreciate the explanations mate 💯