folks who run #pihole: have you ever had a site or app break as a result of using pihole?
(for the purposes of this question, "break" includes having to perform any kind of workaround, not just a fully blocking break)
@gsuberland not strictly pihole but similar artifacts with NextDNS. Some obscure unfamiliar domain is blocked, and login or function of a web site fails. Usually the failure is opaque.