Left-wing bias on Twitter vs Right-wing bias on X?

According to this article from The Guardian, the European Commission is investigating X for allegedly manipulating algorithms to amplify right-wing content.

I’ve done a bit of research and found that there is empirical evidence to support this. For example, one study carried out a computational analysis of X’s engagement metrics - the findings suggest there was a significant algorithmic shift around the same time as Elon Musk’s endorsement of Trump. Not only did Republican-leaning accounts experience a greater engagement boost than Democrat accounts, but Elon Musk’s account did too.

I also recognise that pre-Musk Twitter faced allegations of bias towards left-leaning content for years. I can’t find much empirical evidence for this (feel free to share some if I’m wrong), but it’s clear that right-wing accounts were blocked more often. However, could this have been related to moderation rather than bias?

Personally, I’m inclined to believe that X is actively politically biased in a way that hasn’t really been done before - though I’m not sure if I’m missing something here due to my own biased. So I’d be interested to hear everyone else’s take!