Participante anónimo 740 Can be extended for up to 1 year, but rather than that, it should apply because one is not sure if when will be the next exit. Could be a few days later, a few months later or even a full year later.
This has nothing to do with the type of visa you've got, but whether you have a past "obscure" history with Immigration (like living for years on TR visas or border bounces) or if they suspect you'll be working here instead of being a digital nomad/attending soft power courses.