Is Slime Rancher: Plortable Edition on Game Pass?

No, only to buy: from €18.99 on Steam.

Is Slime Rancher: Plortable Edition on Nintendo Switch Online?

No, only to buy: from €5.24 on Nintendo eShop.

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

From €5.24 on Nintendo eShop; also Steam €18.99.

In no subscription, buy only

Buy

Cloud

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

Is Slime Rancher: Plortable Edition on Game Pass?: No, only to buy: from €18.99 on Steam.
Is Slime Rancher: Plortable Edition on Nintendo Switch Online?: No, only to buy: from €5.24 on Nintendo eShop.
Can you play Slime Rancher: Plortable Edition in the cloud?: Yes, with Boosteroid and GeForce NOW (you need your own copy).
How much does Slime Rancher: Plortable Edition cost?: From €5.24 on Nintendo eShop; also Steam €18.99.