Switter was the third biggest Mastodon instance when it was open. It was specifically set up by, and to be Sex Worker freindly.
Guess what happened... Laws passed in Australia that made running the instance troublesome, and the hosts couldn't afford to constantly legally defend themselves, so it closed down.
Try and find an instance that welcomes Sex Workers and allows them to advertise. Last time I checked there just isn't one. I'm a photographer that works with Sex Workers, and from what I have seen they will stick with twitter until it is offline, then probably head to bluesky.
I don't think you can yet. I noticed the request was made for the blur to be added recently, so I assume it has been developed and put in place without the option to turn it off. I also notice that sometimes it is blurring the user's profile picture instead of the thumbnail, and when infinite scrolling is turned on, it stops blurring after the first page all together. It seems a bit half baked at the moment, but I am sure it will be looked at.
Image previews and thumbnails seem to have scaling (image ratio) issues at the moment as well.