[shin_lao]

Money never hurts. Raise as much as you can, spend as little as possible.

Running out of cash is the first reason why company go out of business (nota bene: you can run out of cash and be profitable, cash != profits).

[CoachRufus87]

Dilution hurts.

[kqr2]

Perhaps Twitter is forecasting a future environment where raising cash will be more difficult or under less favorable terms.

That happened at my last company. Management sold a lot of bonds with stock warrants although we didn't need it at the time. The market tanked and we would have been unable to raise additional cash. That bond money kept the company going a little longer.