[Male here]

Some I know of swear by the comfort and convenience of the cup. They all started with a lot of doubt and hesitation about how it would work, leaks, handling and cleaning it, etc. But once they got the knack of putting it, they claim it to be the best thing since <insert your favorite sliced bread equivalent here>. Plus, there are washable and reusable pads available that are (apparently) a lot more comfortable than disposable ones.

There are at least a few groups in India on more environment friendly and women friendly menstruation products, since the growth of commercial disposable pads is becoming a big environmental issue.

Here are a couple of factors I have noticed/heard of that may affect the adoption of cups. Like tampons, inserting a cup inside requires the woman to be familiar with anatomy and not being scared. The idea of putting something foreign may be tough for women who haven't had vaginal intercourse. With "virginity" still being a "virtue" in India, more so in rural places, women would be shocked if they were asked to use tampons or cups that one has to insert inside. Pads or even reusable/washable cloth pads are a lot easier to sell.

Not sure why you are putting down menstrual cup users. I use one and it really is great. I also told my sister about it and she got one too and likes it. I also use cloth pads on light days. Both beat disposables by a wide margin in comfort.

Everyone has their own preferences.

Some women are similar to you and some are different. I know lots of women who swear by their menstrual cups.

I swear by my menstrual cup. I know it's a niche product but I have no idea why, a possible explanation is that some people are uncomfortable with their body or perhaps they've never heard of it - I had never heard of it until I saw a mention of it on reddit in my mid-twenties. Cups have much higher capacity that pads / tampons, you can't feel them, they are clean, nothing irritates your skin, it's impossible to run out as you only need one and it lasts for up to a decade.

I don't know the con perspective, but I think it's important to point out, especially in the context of the article citing culture stigmas, the tampon was initially niche and the "original" invention first stalled.

Sure, but when you handle used tampon, you don't have to actually touch it. Yes, for me it's just gross.

My GF swears by it. And I fully support her decision to use it. I'd use it if I was born with the bit and had the need.

Probably less of an option in rural India though as a sibling comment pointed out.

I know that adoption is still low, but I do not know why, can you provide me more perspective?

My knowledge is based mostly on the diva cup ads that pop up here.

I imagine it's pretty damn gross, but I'm a dude and the process is pretty damn gross to me.

It's not gross, if anything it's much less messy than pads. Menstrual cups are awesome.

I'm a menstrual cup user. It's not gross cause you're gonna be dealing with those body fluids one way or another.