This seems like a normal cheap android phone with a bootloader-unlocked operating system and some pre-installed ad-block and rethinkDNS’ish Apps imstalled?

And no offence, but the advertising video itself is more scamy then the wedding-dress shop around the corner that is always closed and dusty, but still paying a horrendous amount of rent each month…

I do the exact same thing as OP with KeepassDX at work and works pretty nice so far, since I gave KeepassDX the right acces rights on the nextxloud directory.

What diferences have you figured out so far with Keepass2android in comparison ?