Yea, because that's been working great thus far.
E.g. see https://www.antitrustinstitute.org/work-product/antitrust-en...
Rather than proposing a new technological solution to the problem ("platforms to protocols") which may work but is unproven, we could simply restart the use of existing tools that have been proven to work. This has the advantage of being a strategy that can be explained to non-technical folks.
The "existing tools" have been proven to have a major weakness, namely they can be neutered by regulatory capture. Unless you can get everyone to magically forget how they circumvented the rules last time, you can't simply restart using them.