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Literally no reason to ever do that.

If Bitcoin reaches $1M

Bitcoin network doesnt know its dollar price. So it means you are trusting some oracle.

Also timelocking for "I don't want access my bitcoin for a time" is really dump. If you security gets compromised you cant immediately migrate your UTXOs. Hackers have all the time to figure out your keys/passwords and will be ready for the time timelock is off.