I’m the maintainer of SpellBoy.com. As of September 2018 I’m storing words marked as misspellings that users ignored because they think it is spelled correctly.
It seems that especially in Spanish and French the “ignore” functionality is used more often compared to English or German.
Here are the word lists sorted by how many times the word was ignored (“Total Events”):
Many words on the lists are popular person or brand names (“ipad”, “iphone”, “whatsapp”, “facebook”, …).
I hope this helps in improving the quality of LT.