Hello @starrchris, thank you for commenting on this, and I can tell you that such limitations to participate that you have commented are not "limitations as such", for example, in Steem Venezuela and in Colombia-Original you can publish in any language, and I can say that in the rest of the communities of the challenge can also do it.

Here the link of the Steem Venezuela contest
and from Colombia Original communities:

https://steemit.com/hive-193637/@hive-193637/steemit-engagement-challenge-mis-
amigos-de-steemit-que-quiero-conocer-my-steemit-friends-that-i-want-to-meet

https://steemit.com/hive-113376/@colombiaoriginal/nuevo-concurso-yo-cuido-el-planeta-y-tu-desafio-de-participacion-de-steemit-or-new-contest-i-take-care-of-the-planet-and-you

Your'e welcome to participate.