There's zero evidence of any wrongdoing or shadiness other than them having employees living in Russia. The company itself moved to Cyprus, many of their engineers left Russia, none of their servers are physically located in Russia, and they publicly disavowed Russia's invasion of Ukraine.
This doesn't mean Russia couldn't apply massive pressure by threatening family members, etc, of course, but I personally have no concerns at this time and use AdGuard Home (their local adblocking DNS server) in my LAN and their iOS app on my devices. The iOS app in particular uses Apple's content-blocking Safari tech so it should be completely safe so long as you don't pay for a VPN or use a local VPN to block everything outside Safari.
If you're rooted on Android, definitely use AdAway instead, it just replaces the hosts file.
https://adguard.com/en/blog/official-response-to-setapp.html
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