Right, but thousands is a minuscule number - there are myriads of services out there. While it would've been nice if 23andMe would've used a service like this, can't exactly blame them if they didn't - it's not like this is some well-established industry standard, but more like an extra effort by extra security-conscious companies.
What I'd blame 23andMe for, is having encouraged so much all that sharing of sensitive data with other accounts, without providing additional safeguards to access such data.
