The idea is not to have a character limit but the opposite - add a mandatory character field requiring to add personal thought to the content that is cross-posted (with a minimum of 256 characters).
So there is valuable, original content added/personal thought.
Just like Actifit has had for years (They actually have minimum word count so it is even more requiring).

I use Twitter a lot, so I really like d.buzz

Hive ecosystem is NOT Twitter. Hive ecosystem frontends are something between a blogging platform and Medium with a bit of Reddit (commenting) and the content is rewarded here. Neither Twitter nor Facebook pays you for your content.

I always wanted to use Share2Steem and Dlike but never did because I was afraid that I will get on a blacklist or something.

Creating a spam app does not give a license to spam. The content of these posts is treated the same way as if it was posted without the app.

But try to understand the Dbuzz side too. They have this little Project that is promising and very user friendly, especially for new users. They must feel like David against Goliath.

So far it has been nothing more but an epicenter of plagiarism and/or copypasta spam with zero original content added.
If it teachers anything to new users is that spam and effortless link posting are rewarded in the Hive ecosystem.
It has nothing to do with free speech.