Anonymous participant not if the visa applicants are fraudulent, sure they want people to come legit and and shut down visas before if there was fraud etc
These businesses will be pushing for new packages being needed or report the applicants no longer students etc to immigration - the whole program depends on money being spent in these categories
DTV is treated as a tourist visa not resident visa - you will need to pay a agent, welcome to Thailand unless you have a resident visa most activities will require a agent