1) ISPs request bridges and blacklist them, that means obfs4 connections could be listed as Tor, does that mean the ISP is able to see the obfs4 IP and connect your activities to Tor just like without obfs4?
2) If the ISP knows you use TOR, although you may not be doing anything illegal, could that make you a target and have you reported to an intelligence agency for investigation?
3) Is there any way to protect yourself from the above?
4) Is there any difference in what the ISP sees when using Tor Browser to when using Tails?
Thank you