Thanks for the article - it seems people will do anything to get publicity for their businesses. In this case all he's done is show up his ignorance - Ancestry has been owned by private equity companies for most of the last decade, so in that respect nothing has changed.
Ancestry's Privacy Statement will reassure anyone who bothers to read it; Blackstone have also made it clear that they will not be sharing the DNA information of Ancestry users with other companies in their portfolio (which technically might have been allowed under the Privacy Statement). Users in the UK and EU are also protected by GDPR which imposes enormous fines for breaches - up to 10% of global turnover, if I remember rightly.
The comment in the article about the sharing of Ancestry DNA information is also misleading. Only someone you appoint as Manager of your test has access to the raw data. Other options - Viewer and Collaborator - give no access to DNA data.
The biggest problem for family historians is that scare stories tend to get more publicity than true stories, reducing the chance of cousins who are not family historians, and don't really understand the significance of DNA, being prepared to test. It's particularly sad when members of the oldest generation refuse to test, because up to half of their genetic inheritance is lost when they die (all of it, if they don't have children). Lost DNA is like a lost parish register - the information is almost certainly gone for ever.