It's absolute hogwash that you can't insure a rescue animal. We've had rescues for the past 2 decades and have never had any issue insuring them.
That said, I do agree that most pet insurance is shit. They pay out for little cheap procedures, but for things that run into 4 figures, they often find a reason to not pay out. Or there will be something in the smallprint that allows them to not pay for certain things/operations, or there will be a limited amount they will pay out on an ongoing condition. (like diabetes.)
As our animals got older, we discovered things that were not covered, (eg; eye treatment like removal of cataracts, and dental treatment,) or if they needed to go on long term treatment for something (like diabetes,) they would pay out for no more the first 12 months!!! So we stopped insuring them (probably 10 years since now.)
We have saved around 7-8 grand in insurance in that 10 years. Not paid a penny out. (Other than for preventative treatment that pet insurance doesn't cover anyway!!!)
Nothing has been needed for any of our pets, and two of them are at senior and elderly age now. (None of them have ever needed cataract or dental treatment, by the way, I just found out when I read through the policy thoroughly!)
Also, regarding the comment about people going on holiday with no insurance and expecting people to pay when they get ill/have an accident. I don't think this is the case with many. I have heard cases though, of people going away, and something happening, and the insurance company pulling everything they can out of their arse to not pay up.
One lady (in her 60s,) tripped and fell and broke her leg (when me and DH were on holiday in Spain some 5 years ago,) and the insurance company refused to pay for the treatment in the Spanish hospital, because she never declared she had smoked for 15 years, from her early 20s, until her mid 30s. (She had stopped around 25 years before!!!) Absolutely FUCK-ALL to do with her fall, and her broken leg, but they pulled this out of their arse as a means to not pay for her.
When filling in the form for insurance, there was a section that said 'if you have ever smoked, how long did you smoke for, and when did you stop?' and she never filled it in. As I said, this was fuck-all to do with her broken leg! And she had no idea how they found out she smoked for 15 years in her 20s and 30s!
Insurance companies really are pure scum sometimes. They happily take all your ££$$$££, but often won't pay out when it really counts. (ie when it's a lot of money to pay out!)
Re the OP, I loathe this go-fund-me stuff too most of the time. There are occasions where I don't mind it, like if it's for a vet bill. But yeah, if someone has the means to pay (by selling something valuable,) it's a bit of a cheek to ask others for the money.
Then again, it's not breaking the law, and if people want to give, then that's up to them. These sites should be policed way more though. They are like the mid to late 2010s equivalent of the chuggers/charities begging for money.
Sad tales to rope people in. Some people (particularly the elderly and the vulnerable,) have been known to give everything they have got, and have ended up having to beg for food from people they know.