I've just reported the following message to Ancestry:
Hi there,,,,
I hope this message finds you well. Please accept my apologies if this reaches you unexpectedly—it was never my intention to intrude. I came across your profile after been redirected from google (where I searched for your surname) to this website and felt compelled to reach out regarding something significant related to your surname.
As someone new to this platform, I’m still navigating how things work, so I sincerely appreciate your patience and understanding. This matter could be truly impactful, and I’d be honoured to share the details with you privately.
If you’re open to it, kindly contact me at {email address}, and I’ll provide the full information and documentations I can’t share here. Thank you for your time, and I look forward to the possibility of connecting.
Warm regards,"
Newly created account, and no-one is going to Google one of the more common surnames in the country and land up on an Ancestry profile.