As a person that has used Instant Ink before. It’s a threat. Run.
Was ist not good? I was considering it for home use, since I very rarely print anything and the 1€ a month would maybe be worth it for a headache-free printing experience.
If you rarely print and don’t need to print in color, I would suggest getting a printer that uses toner instead of ink cartridges. Those printers are a bit more expensive and so is the toner, but what’s really nice is that you can print like a thousand pages on a single toner cartridge - and those will never dry up due to being a powder. You can get a no-frills Brother one for under $100 when they go on sale, and HP has some that can also go under $100 on sale.
That being said, if you don’t mind paying 12€ a year for not printing most of the time, then go for it, but like @scarcer said, you will need to reach out to HP and call them if you plan on printing more than what your plan normally allows.