Is Alabama spending as much as Texas, Georgia, Ohio State? No of course not. Is money the reason they are losing all of these guys however? Also of course not.
Money matters, but players commit to coaches too and Saban was the biggest draw of them all. I guess I don't see why this is surpising to anyone. The way things are structure (which sucks by the way) is that if you're good and you have a coaching change, you're going to get decimated and so are several others in your wake.
I would venture to bet that Alabama will be one of the most active in portal acquistions in the spring. In the wake of Saban retiring DeBoer is going to loose a ton of talent... and Fisch will lose a TON from UW because DeBoer left... and Arizona will lose a TON from Fisch leaving... and right on down the food chain. Alabama will be the best positioned to restock the cupboard of that chain, but it's still brutal on a roster.
We're probably in a window, until something changes, where mediocre programs can't afford (or think twice about) firing coaches because you'll lose your whole roster and not have the funds of the high end NIL spendings to do anything to restock and be stuck in a world of hurt.