I've also occasionally seen posts about tech support companies that are legitimate and it's perfectly legal for them to sell tech support services even if they're not the OEM. We may not like them and consider them a rip-off because they are often monetizing some peoples' severe computer illiteracy, doing things people don't actually need, charging far above FMV.
But that alone is not illegal unless they're directly lying and/or misrepresenting themselves or what exactly they're charging for. Shady? Yeah probably most of the time. A scam? No.
Like this one for example I found posted on here,
Their business address is in Yuba City which is basically like Punjab in the middle of California Gold Country. So it's not surprising they're all Indian. But they admit they're a 3rd party and not affiliated with Microsoft, Google, etc and they don't cold-call people and/or use any of the normal scam tactics.