In the absence of any insinuation by the OP that the first company put any pressure on them to accept the offer within any time frame at all it's pretty wild speculation on your part to accuse them of "exploiting" them.
(it's just as easy to assume the latter... that the first offer was accepted because it was perfectly reasonable and the second company was slow to make an offer and poor at communicating. If the second company did take a surprisingly long time to make an offer that's actually another variable to take into account; possibly representing organisational problems or a preference for other candidates at their end)
(it's just as easy to assume the latter... that the first offer was accepted because it was perfectly reasonable and the second company was slow to make an offer and poor at communicating. If the second company did take a surprisingly long time to make an offer that's actually another variable to take into account; possibly representing organisational problems or a preference for other candidates at their end)