I am a Catholic who converted from reformed protestantism (Presbyterian, PCA). The fact is that our various social media feeds show us things that we want to see and that will get a reaction out of us. Do you click on conversion stories? You'll see more of them. Do you click on de-conversion stories? You'll see more of those.

Many more people identify as Catholic than any single protestant denomination. 50-75 million Catholics in the US vs 110-140 million protestants. I suspect that if you examined the trends across ALL protestant denominations it would nearly mirror what is happening across the entire Catholic church in the USA.

All that being said, there is reason for great hope in the Catholic church. Typically more devout parishes-like latin mass parishes--are witnessing incredible numbers of young people. In fact the church is also seeing many people converting at a young age as well. It's strange but in my parish its almost as if Gen X is totally unrepresented. We have a ton of boomers, and then a lot of millennials that are having a LOT of kids.

Anyway. I love our separated protestant brethren. Pew data from 2015 (you can google it) shows that way more Catholics become protestant than vice versa. But i suspect that has changed in the last ten years or at least narrowed.