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Be carefull, the game will be full of microtransactions.
A second character slot currently costs about 10$.
https://www.rockpapershotgun.com/2018/02/23/metal-gear-survive-sv-coins-explained/

Well can't say I didn't expect! Microtransactions are littered in almost every game nowadays :(

Here is to hoping it was just something innocent as you say haha :)