MIG Switch currently has a monopoly on Nintendo Switch flashcarts. However, it may soon face a rival in the UnlockSwitch. The two are already claiming that both are scam artists, though.https://www.notebookcheck.net/UnlockSwitch-New-Nintendo-flashcart-still-in-development-following-denouncements-by-MIG-Switch-team.833671.0.html
Plot twist: they're the same company just trying to generate interest.