Mullvad, please.

nordvpn has been acquired by some private equity that's acquiring all the vpns.

I know that Nord Security the company that own nordvpn has acquired AtlasVPN and I also know that the VPN market is quite concentrated, 7 companies owns dozens of brands. I would like information on those acquisitions... have I missed some important news?

I would like to know because NordVPN, while not as hardcore on privacy as mullvad, is still providing a useful service for protection against an untrusted wifi and geofence jumping.

Source? NordVPN was and is owned by Tesonet.

do you agree based on your understand that if this TOR user had used Mullvad VPN services (or equivalent) he would've been fine/not detected by the FBI?

If FBI really has compromised Tor, there's no reason to believe they would be helpless against a VPN service.