I also have 150k pages with #appwatch but I chose not to submit them all at once. I'm wondering what is the better option.

Congrats!

Not sued, but I received a Cease & Desist from LinkedIn.
Don't anticipate problems too much before they come, unless you're really building something that will 100% get your sued. If you are in this case, I would not do it unless it's an opportunity absurdly big.