period
I would not trust adguard as it is a russian company that nobody knows what it does to your data
They are locsted in Cyprus, and in fairness, they’ve got a much better reputation than most privacy/security companies out there.
Plus, depending on the service, adblocking is done locally.
I mean adguardDNS. That can raise some questions. And as for Cyprus, many russian companies are based there just to avoid sanctions. That means nothing