I believe that these freezing mainly happens to UK banks like HSBC Jersey or HSBC UK.
I have never heard about a freezing at HSBC Singapore, HSBC Turkey or HSBC US.
Probably the main reason is that they changed rules in Turkey and only two state owned banks can open accounts if you don't have Turkish residence permit/ citzenship. Ziraat and Vakiflar.
From this point HSBC Turkey started to be crazy with foreigners.
What nonsense are you talking about? Have you looked the Tier-1 capital ratio of these banks up? The history? Etc.
You clearly have zero experience in Private Banking.