It looks solid. Mullvad partnered with them earlier this year. However, I'm always hesitant on privacy/security focused apps that haven't gone through an independent 3rd party audit—no independent audit for Obscura VPN yet, they said back in March they were "commissioning a security audit" but nothing's been published since the service launched in Feb 2025 (Mullvad's audits are separate), so I say, if you're going to use it, use with optimistic caution.