It’s not a US startup, it’s UK according to the website.

"Wealthy startup steals EU trademark" still works as most will fill in the blank with US.

Unicorn startup bullies small EU company by stealing their trademark - and the gov allows it!

Even better for clickbait: "Wealthy Brexit startup steals EU trademark".

Still, not EU (currently).

Maybe append “venture backed” at the beginning.

“A Multimillion Dollar Company Stole His Trademark. You Won’t Believe What Happens Next!”

You won't believe these outrageous trademarks exist!

How to make you trademark sizzle with sexy!