My not so good evaluation has other reasons. SwiftKey is of TouchType Ltd. produced in GB. In the PrivacyTerms though is that personal data can not be read and not saved, furthermore, that no password entries are read. But here you have to have a lot of faith to believe that. I write my messages only encrypted, but what good is the best encryption when the app is capable of this (in theory) read?
Faith is good, but control is better for me, and so I've uninstalled the app again. Another point, which is not like me, that it is a British company, and there is very short distance to the British secret service here. I would refer at this point to Fyve Eyes or UKUSA Agreement:
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So if you trust the app, they should be installed and thus be happy. I have other priorities.