IF ANY t-shirt says the word "steemit"
AND/OR
Has the new green logo on it
It is in violation of their intellectual property right to their brand.
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If any t-shirt being sold or given out has the OLD steemit logo, (but still steemit name), it will also be in violation. It's not just the logo (but the steemit name itself)
If you used "STEEM" (and not STEEMIT) then you're okay.
If you make 2 cents on this post where you have used the Word "STEEM(it)" you are also in violation - commercial gain from using their name.
You can use the word Steemit in discussions.. that's fair use.