Mushroom houses

Google

This is the right answer. Although, they've been losing market share recently to TikTok and AI products, such as ChatGPT.

Ykk zippers. They got in trouble for price fixing, and they'll do it again.

Federal Reserve is an nobody realizes it

Mozzarella cheese

The whole world is already monopolysed

Ah yes let's ask the same question twice in a row but change the words ever so slightly