Most people are able to use those systems, it’s just the demand to learn Hokkien/Min Nan/Taigi is fairly low and thus there’s nothing like Duolingo or Rosetta S

Most people are able to use those systems, it’s just the demand to learn Hokkien/Min Nan/Taigi is fairly low and thus there’s nothing like Duolingo or Rosetta Stone support for the dialect, or many tutors nor language books for them.