Is the capital Y on "You" becoming a thing?

Something I have noticed recently, in many international forums (i.e. English-speaking with many non-native speakers, including SE), is the use of a capital "Y" in "You", especially in "Thank You": I would tend to believe this comes as an analogy with "I", or as a way of showing respect, but of course it might be completely random.

Is it something that has been "imported" by non-native speakers, or is it a trend in the English language which might eventually become a valid form?

Solution 1:

According to Ngram, it is a relatively new trend. If you look at the chart except for a bump in the 40's (probably has to do with the war and all the posters where capitalizing was used for emphasis) it seems to have started in the 70's.

Still, Thank You seems to represent around 5% of the usage of Thank you, in written form only, obviously.

Also related, see the answers in this :“you” versus “You” as polite form of writing