As I saw, that Holo is back, I was very happy. But it didn't last for a long time, because SwiftKey requires a login for that. I don't understeand what themes have to do with a login.
Once I purchased the app. Now it's for "free". I think, SwiftKey want to force us to login, so thy can use the keyboard as a keylogger. Everything the user type with this keyboard will be send to servers in a foreign country, where I have no rights and no control over my data.
SwiftKey promise not to steal passwords or credit card data, but who controls this? I don't believe this, because this data is very valuable. Intelligence agency are surely very interested.
And even if this is true, I don't want, that SwiftKey sells everything I wrote with this keyboard to whoever pays for it.
If you get something for free, you are the product. And I even didn't get the app for free, I purchased it once. So I paid for selling my data.
This is not acceptable!