Yes and no.
Broadly, at this point, I couldn't care less what Reddit does. This is my new home.
In the weeks leading up to my move here though, it wasn't so much that I was concerned about the third party apps specifically. I did use one - RIF - and the official app is complete garbage, so it would've impacted me negatively, but it was more than that. And yes - the certain increase in censorship was another issue, but still, it's deeper than that.
Both of those things, and much more, are really just aspects of the process that Cory Doctorow has called enshittification, and that's the thing that drove me away. And if I was still on Reddit, that would be the thing I'd be concerned about.
So it is the case for me that it's not just about the third party apps, and that censorship is also a concern, but really those things, in my estimation, are just signs of a deeper, underlying issue.
Which I no longer have to care about.
Where are you seeing this supposed anti-semitism from the left?
I've literally seen zero anti-semitism from the left. Every single anti-semitic statement or action I've ever seen has been by someone on the right.
Now the left does tend to be anti-zionist, but much though warmongers like Netanyahu might want you to think so, that's not by any stretch of the imagination the same thing as anti-semitism.