Netflix - The Get Down, Bloodline, House of Cards, Daredevil, Jessic Jones, Luke's Cage, Better Call Saul, Marco Polo, Sense8, 3%, Orange is the new black, Stranger Things, Unbreakable Kimmy Schmidt, Grace and Frankie, Love, Travelers, Fuller House, Breaking Bad, Master of None, Power, The OA, Black Mirror, Flaked, The Crown, Narcos, Wer Hot American Summer TV series, Chealsea Does, Gilmore Girls.
Amazon - Goliath, The Grand Tour, Red Oaks, Good Girls Revolt, Crisis innSix stages, The gf experience, The Last Tycoon, Mad Dogs, Mozart in the jungle, Alpha House, Hand of God, sneaky Pete (full season starting next week), Transprent, The man in the high castle, Bosch, Gordimer Gibbons life on Normal Street.
Yes not much content there and that isn't even including movies... also a lot including The Grand Tour are also in 4k HDR.
You say you had a 4k TV? Have you checked at all lately as ***** all I watch here in those streaming apps is 4k content. An hour of content here or there? There are hundreds of hours worth. Thousands even... Just the first season of The Crown is over 10 hours worth.