Free premium channel previews on paid cable / TV providers (HBO, Showtime, Starz, Hallmark, Cinemax, EPIX, etc)

Ongoing list of free premium previews on paid service providers. Furthest date at this time is Feb 4, 2020.
U-Verse, DirecTV, Verizon FIOS, Comcast, RCN, Frontier FIOS, Suddenlink, etc
https://www.freepreview.tv