[RPG] How many simulacra can Sansuri’s Simulacrum create

This problem is easily circumvented once you have access to wish:

1. Cast Simulacrum to create an exact copy of yourself (minus one 7th level spell slot).
2. Tell Simulacrum-1 (Sim-1) to cast wish to make a simulacrum of you (does not require materials). Sim-2 has been created.
3. Tell Sim-2 to cast wish to make a simulacrum of you (creating Sim-3).
4. Repeat until you have the desired number of simulacra.

The simulacra all have half your hp, and are missing one 7th Level spell slot (and one 9th level spell slot once they have cast wish).

This can be used as many times as you like (/can be bothered with, as each casting of wish requires an explicit command). Also, the simulacra cannot act independently; they require orders for every action, which can become tiresome once you have too many. Also, they can be got rid of with dispel magic.

Keep those limitations in mind, and you should be able to take over the world with a simulacrum army (assuming your DM doesn't ban the whole thing once he cottons on to what you're doing - I certainly would).

Note: This strategy is explicitly disallowed by the Adventurers League FAQ Version 6.1, which states: "Simulacrums can’t cast simulacrum, or any spell that duplicates its effects."

You may wish to look at: Can a Simulacrum cast Wish?

You Are You; and So Is He. If a simulacrum you have created casts wish, both you and your simulacrum suffer the stress associated with casting the spell—including the risk of being forever unable to cast wish again. The inability to cast wish extends to any simulacrum you create in the future.

The above is taken from the D&D Adventurers League FAQ March 24, 2017, currently available here.

However, that stated, these rulings are for the balance and survival of Adventurers League, an organized play setting, and not explicitly the traditional table setting. Without explicit rulings like this on things the books don't cover, a nationally organized play association would not be able to run reasonable events with a common experience across all venues. Having a whole lot of "This DM let me do it at this event" isn't healthy to that ecosystem.

It is well understood by many players and DMs alike that rules as written for Simulacrum + Wish can be exploited for some serious imbalance in player agency and power: you can do anything you want without suffering the usual consequences. While I can't speak to the true intent of Adventurers League, this is likely why Adventurers League has made this decision despite there being no such restriction in the Player's Handbook to that spell combination.

By RAW it works because the Simulacrum is a separate creature, it just happens to have your resources and abilities.
By AL rules it doesn't work, because the Simulacrum is treated as you for the purposes of Wish.

Your DM has Rule 0, not even wizards can stop that!

Wizards doesn't have final say at your table. They give you the system, the basic foundations of the mechanical bits and pieces of your storytelling experience. Your DM can decide to use this ruling as an example of best practices and put it into practice in their game. Or they can decide that your game doesn't need the measures against Simulacrum + Wish synergy and allow players which earn those abilities/spells to be able to use them in that way.