I don't honestly know what we have, but we say "okay google" so it must be some version like yours. It was a gift and I despise it. Dh set it up so it responds best to his voice and the rest of us have to repeat ourselves every.single.time in order to be heard.
OTOH, i use it exactly as you describe (nothing special set up or logged in) and it is useful as a music speaker (I don't have any subscriptions set up), kids can ask the weather, it tells jokes and puns, answers questions. It doesn't do much else for us. 99% of the time it won't play the music we request because we aren't subscribers, but it will go on to play similar music and often even by the same artist. The kids have discovered some music/artists they really enjoy that we would never have found otherwise. I can't imagine ever paying money for it, but I tolerate it and just unplug it when I am out of patience.
ETA: It lives in the kitchen and is super useful for Ds1 when he is doing the dishes or Dh when he is cooking. It will play NPR or other podcasts (I think) so they can work with it hands free.
Ds1 (2006). Ds2 (2010). Ds3 (2012).