No, you should avoid trading via unregulated forex apps, as some of these brokers may be scam. Also, some brokers may simply register under Offshore regulators to avoid scrutiny.
Some regulators have weak regulation standards (especially offshore regulators), so many forex brokers try to get regulated under these jurisdictions because it is easy. But this can backfire for the traders as weak regulation encourages poor corporate governance and fraud. Tier 1 regulators from UK, Australia, and other developed countries are considered the safest.