Microsoft reuses its OpenAI playbook with Inflection takeover
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TRS also aren't really used to hide ownership but to get economic exposure when you can't actually own things for whatever reason. The Archegos collapse was mostly a risk management fault at Credit Suisse unrelated to the means they got that exposure through. Archegos's other prime brokers mostly liquidated their positions with no losses. TRS are transparent to your broker and to regulators
In the Archegos case the "whatever reason" was at least partially (as well as getting extra leverage) so that ownership didn't need to be reported to the SEC - allowing them to 'own' 50%+ of the shares of several companies and manipulate the price without the market knowing.
Item 30 and 58 of the SEC complaint: https://www.sec.gov/files/litigation/complaints/2022/comp-pr...
I suspect the intent behind the position disclosure is so control is disclosed, not economic exposure. The design of the regulatory system in the US is that you're either regulated and thus have a lot of responsibility and reporting requirements, but you get better access to the market (Archegos's brokers); or you're 'unregulated' and have less (but access the market through a regulated company).
Also you don't usually get different margin treatment through TRS than you would through normal ownership. If you do, your prime broker is doing something stupid. Your TRS is a contract with them, they tend to just go buy the shares to hedge so it's usually exactly the same as buying your long through them (except you can't vote your shares, you don't get dividends and you can't lend your shares).