I don't think I've ever seen a 1000%, must be a thing from before my time. These days even 200% seems more and more hard to find, especially with established casinos.
There is this one group of linked casinos - Rooster.bet, Spinjo, Lucky7even, PlayMojo and a handful more - who bombard you with regular 300% bonuses as soon as one of them have sucked you in, usually with 10x the bonus amount in max cashout (which can be a nice sum on a 300%) but with only 72h to complete the fairly high 40x wagering.
Slot Lords, too, have a 300% every now and then, with slightly friendlier wagering terms but only 5x max cashout.