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Re:Security.txt (2017) by fb03 on Wednesday February 13, 2019 @07:26AM (#19152510)
.well-known is also used for ACME for auto-certificate generation and renewal.

I still would like to know the backstory around this folder, just like OP.

Re:Security.txt (2017) by cyphar on Wednesday February 13, 2019 @12:08PM (#19154568)
It's a standard directory with an RFC and all[1] and is widely used for a whole bunch of things, not just LetsEncrypt (such as WebDav).

[1]: https://tools.ietf.org/html/rfc5785