As hobbies go, I've come to find that gacha game spendings aren't that out of line. Most hobbies are expensive, it's just that gacha games are one of the more obvious examples of our time and our world view.
If you're doubting me, take a look at hobbies like ham radio or cars or golf or whatever really strikes your fancy. The vast majority of hobbies are expensive, they will make your eyes water if you aren't used to throwing wads of money around for fun. Even a gaming computer can run you a few thousand dollars, not to mention the games themselves, and I think gaming is a hobby most of us can relate to.
Another thing I've come to find, from keeping a journal of my own spendings, is that while the total sum might seem ridiculous it's actually nothing unusual when considering the length of time that money was spent over.
To use myself as an example, I've spent somewhere around $12,000 on FGO over a span of about 7 years now. Is $12,000 a huge sum of money? Yes, absolutely. But according to my Excel spreadsheet it's also about $1,700 a year or $140 a month or just under $5 a day averaged out. I spend more than that per month on just costs of living, even just eating out a couple times will cost as much per month. And remember, that's averaged out: I can go for weeks and months without spending anything if the game doesn't interest me.
I suppose what I'm trying to say is, a lot of the anti-video game and anti-gambling crowd have started to sound more like a certain segment of people demanding others shouldn't have fun. It almost sounds like a new spin on "Video games are making violent children!" because that topic has gotten stale.
Is gambling addiction a thing? Yes, and it is unfortunate; some people really do need help from themselves. Irresponsible parents and children who don't know better also inevitably exist, and they too need some safety wheels so they don't trip over too hard.
But responsible adults spending significant sums of money for fun is not and should not be a problem by itself.