Smiling Face with Tear Emoji We're Sorry.
Tubi is the largest free movie and TV streaming service in the US. Unfortunately, we're not currently available in your area.
People here assume it's developers' fault. This is just a speculation (at least, OP only mentioned it as a possibility). It could be, for example, that developers previously used one of their client's accounts (to deploy an app), which was later banned (could be even for a different app they have no connection to).
Some information is missing here (developers' side of story?)
Or just learn how to craft search queries on DDG (instead of google assuming it for you). Nothing wrong with DDG. Lot of people like it. Why shouldn't anyone suggest it to others?