800-275-2273 is AppleCare: 800-APL-CARE. I've had it in my contacts for probably 20 years and more.
Crowdsourced determination of what is and is not a scammer's phone number has led to various databases listing lots of valid phone numbers being those of possible scammers. People get calls they find annoying or that they never even answer but whose numbers they don't recognize (and haven't put in their contacts, so they just look like random unknown numbers) and report them as scammers. They just want their phone to stop ringing, so they report the number. Enough of these erroneous reports, and the databases list the callers as possible scammers. Collection agencies, credit card companies, banks, all kinds of big businesses (like Apple) are not technically scammers...but they call a lot of people and so a lot of people report them and so they wind up on those lists.
The only time calls are made from 800-APL-CARE that I know of is when you've already spoken with AppleCare and your call's gotten cut off or they've agreed to call you back; they're only ever calling to help you with some problem you're having, as far as I know. But people forget about this, see the unknown number, and *boom!* - report the "scammer". Ah well...