@nukeador That’s great to hear, thank you for the update.
I would say anything you write is CC0 (if you choose to license it as such!). So anything you write from memory, including proverbs, can be added to the sentence collector.
Similarly, the simple sentences in Tatoeba may be licensed as CC-BY, no one owns the phrase “ذهبنا إلى لندن العام الماضي.,ذهبنا الى لندن العام الماضي” (“Last year we traveled to London”) – regardless which book or website it comes from. I think the copyright applies to the entire database, not individual sentences.
It would be nice if there was some legal guidance on how to use large CC-BY resources for various languages without each contributor needing to make a moral judgment as to whether they are somehow pirating something.