They won't even get sued for $1B let alone $75T, simply because
a) If you combined Earth's money together you would have around $750T, one company alone wouldn't have 10% of Earth's Money.
b) They didn't really cause money damage to those companies when they were making multi-millions anyway.
c) $75T could solve poverty and problems across the planet.
d) Each company would get around $6T if the case goes through, thats around 100 times the amount Bill Gates has.
e) This is another 'publicity' case which will gain those companies who are sueing, money.