The same is also true of Pluto TV. It has its own dedicated Transformers channel (simply titled "Transformers TV") that marathons multi-hour blocks of at least G1, Beast Wars, Beast Machines, Energon, Cybertron, Animated, and Robots in Disguise 2015.
All of these (minus RID2015 for some reason) are also available on there to stream, along with Armada, Rescue Bots season 4, Cyberverse season 3-4, and Dark of the Moon.
Meanwhile, Tubi has G1, Beast Wars, Beast Machines, Armada, Energon, Cybertron, Animated, and Prime seasons 2-3 to stream.
Both Pluto TV and Tubi are also free.
Netflix has Prime season 1, Rescue Bots season 1, RID2015 season 1, Rescue Bots Academy season 1, Cyberverse seasons 3-4, Siege/Earthrise/Kingdom (of course), and BotBots (also, of course).