There's arguably societal benefit to the broader availability of DNA data but very little of that passes down to me personally and there are risks. I have very few close relatives but it's not hard to imagine the widespread use of this data by law enforcement would pull in some people with more extended families into investigations they'd rather not be involved in.
23andMe shows up to 1500 DNA Relatives for each user (outside of subscription features).
What we know thus far is that the malicious persons who compiled these datasets are scraping user profiles of DNA Relative matches who are related to the accounts which they were able to directly compromise (likely as a result of password reuse). The posters claim to have accessed around ~7M profiles, which means the lower limit for directly compromised accounts is ~4700, although likely much higher (maybe a factor of 10?), given the overlap in match lists, and provided that their boasts are true. So that's potentially ~5000-50000 profiles.
For those directly compromised accounts raw data could be downloaded. For profiles scraped, it would not be feasible to obtain raw data. However it is possible that partial genetic sequences might be assembled for matches. This was at the core of security researchers' investigations into GEDmatch a few years ago [0]. 23andMe does not face the same vulnerability, however with enough compromised accounts it is likely possible to infer a modest proportion of the DNA sequences of profiles which are known to match.