Of course, currently the proxy system is the most used both from the point of view of the vote on the witness and as regards the path of voting trails. This is because many users and old investors, have moved away from the platform drawing only the benefits of automating as much as possible their actions on the chain. This involves a large amount of voting in the hands of a few and the impossibility of having a fair reward distribution.
I’ll leave you a screen of the various proxies:

tnx to arcange https://hive.arcange.eu/witnesses/

As for the exchange vote also it is present both in the witness landscape and in that of the blog. Needless to mention who and how, through hive.arcange.eu and other tools, you will see many interesting things.
there is the bernie' witness still active(innerhive), and five witnesses under the top 50 who haven’t updated the price feed in years, are still all vote given by the accounts on the steem chain, which have been inactive for years.