Your examples are completely different. Eating a crappy diet now has very well-known, basically deterministic consequences. Ditto for drinking too much or burning oil or blowing all your money. There's no question what will happen if you do these things.

Most of the complaints around big companies seem to be around things they might do (e.g. Amazon could gain monopoly power and raise prices to exorbitant levels) but haven't yet done, and could easily end up never doing.