Other websites like twist and aniwatch do not rip off sources from illegal sites. They use crunchyroll and MaL to determine which anime they should add in next, they have databases, not fresh releases, you can watch old animes and will have to wait for developers to blend it in the website. Websites like kissanime and gogoanime immediately find trackers and upload it to their website.

Also note that, websites like Twist and Aniwatch do their job quite legally, they buy the series before they upload it, which is a violation of copyright infringement but could be avoided by not mentioning their source, it is possible that they buy bluray copies directly from Japan from a remote seller and upload it. Sites like myanime was taken down due to this.