Is DRAGON QUEST III HD-2D Remake on PS Plus?

No, only to buy: from $59.99 on PlayStation Store.

Is DRAGON QUEST III HD-2D Remake on Nintendo Switch Online?

No, only to buy: from $59.99 on Nintendo eShop.

Yes, with Boosteroid (you need your own copy).

From $59.99 on PlayStation Store; also Nintendo eShop $59.99.

In no subscription, buy only

Buy

Cloud

Prices are the store price, without subscription discounts. Struck through: the price before the discount.

Is DRAGON QUEST III HD-2D Remake on Game Pass?: No, not at the moment.
Is DRAGON QUEST III HD-2D Remake on PS Plus?: No, only to buy: from $59.99 on PlayStation Store.
Is DRAGON QUEST III HD-2D Remake on Nintendo Switch Online?: No, only to buy: from $59.99 on Nintendo eShop.
Can you play DRAGON QUEST III HD-2D Remake in the cloud?: Yes, with Boosteroid (you need your own copy).
How much does DRAGON QUEST III HD-2D Remake cost?: From $59.99 on PlayStation Store; also Nintendo eShop $59.99.