Presumably it has the same simple safeguards that a US system like Zelle or Venmo have. I needed to pay my sister-in-law $1300 the other day, and forgot that I have a $500/day transaction limit in place for such transfers, at my own choosing (setup when I opened the account).
Yeah Pix lets you choose limits. There's decent granularity for those, you can pick max $ per day, per transfer, per period, and per device. There's a caveat that when you increase a limit it takes a day or two to come into effect (basically to avoid people being forced to increase their limits by criminals).