EDIT: the owner has suspended the service, stating: "indefinitely [suspended]. Valid concerns were raised and I don't have the energy to rebuild it the right way."

Will do a write-up on this later.

Original post (shortened):

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Threadstodon is a simple and clean toll to unroll #mastodon threads into an easy-to read format

Works exactly like you expect: give the thread URL, and you get an clean and easy-to-read formatted page of the thread back, that you can also easily share as well.