I'm more referring to rather extreme cases, people that look like Predator or Jabba the Hut.

Then it actually routes back to the first comment on this thread, somewhat.

Certain niche fetishes that men in particular engage in, we'll take the feeder fetish here to base this example on, often involve unconventionally attractive individuals who are often very vulnerable.

Take Obese Woman 1 (OW1 for short).

OW1 has a problematic relationship with food, and is physically obese as a result. This also poses a danger to her health and is likely already affecting her mobility. While this may be unattractive by current society's standards, it can attract a partner with a feeder fetish.

Meet Feeder Fetish (FF). He's a relatively attractive man, rich, accomplished, and he's dating the human equivalent of, as you say, Jabba the Hutt.

FF could have chosen to date OW1 for the express reason that she's already struggling with her excessive weight and health, because it's easy to just "support" them by enabling their binge eating, and having them gain weight as a result.

The end goal here is complete dependence on them. FF can continuously push OW1 to eat more and more under the guise of "Oh it makes her happy", until she's completely immobile, bedbound and her health is in serious danger. Often, FF might actively resist or try to thwart OW1's attempts at weight loss even if it's with the goal of improving their health outcomes.

See this video where a relatively attractive man is upset because his obese partner wanted to lose weight, likely to improve her health. You can search up "feeder couples" on YouTube.

I've also heard of men with hero complexes that are specifically attracted to women who are undergoing a bad period of time in their lives for similar reasons, because they're highly dependant on them, and once they get better, lose attraction and may even try to sabotage their lives to drive them back into a crisis state to regain attraction. (Ref: YouTube vid, Reddit Post)

These may not be healthy relationships, you might be looking at a potentially abusive dynamic.

While you cannot assume this for every relationship, often extreme relationships are based on messed up things behind closed doors.

So yes, in response to a prior comment you made about this - if a woman wasn't picky she would be able to "stonk" in their relationships. But what risks are they not considering? What red flags are they purposely ignoring when they don't think too hard about who they choose to date?

Tl;Dr: People can love any shape and size, but it's not always for good reasons.