if a colleague were to share this image at work, i would tell them to stop wasting my time with this dumb stuff. if it was a member of a team i am leading i would tell them to stop goofing around and get back to work.
if on the other hand, someone would denounce this person for sharing inappropriate images, i would consider that an act of oppression. we are supposed to work together, and not against each other.
a work culture where every little transgression has severe consequences is not healthy.
if this image makes someone uncomfortable, they are welcome to talk to me and i will listen to learn why. i suspect most likely, it's not the image itself that's the problem, but the attitude of those who laugh at it. i will then talk to those people and do my best to get them to improve their attitude about such matters.
there are things that are inappropriate to do at work, and one of them is to make dumb jokes like this, but that doesn't make the image itself not safe for work.
and as for choosing my workplace, i come from a country where employees actually have rights. and one of those rights is to share their personal opinions, even if others disagree, as long as doing so is not disruptive. the idea that the leaders in the company can tell their employees what they are allowed to talk about or not is rather alien to me.
this doesn't mean that it's ok to say or share things that are hurtful. it only means that there is no topic that is a priori not allowed to be discussed at the work place.
if this image comes up because someone in my team actually did mistype their url, they may share it with the team, and if they have the appropriate attitude, they will dismiss it, denounce the maker of that website as juvenile and move on. if someone walks by, having no idea why this image is there on the screen, they may inquire about it, or come to me and ask me what that is supposed to be about. we'll check, find out and move on.
calling this image not safe for work, creates an environment of fear, that itself is not healthy and in the country where i come from, not acceptable.