My experience is very different. In general read ratio for me has always been around 50%. That hasn’t changed over the least year and a bit. Before that I have no clue because we didn’t have that number in our stats. While anecdotal, a sample size of over 60 boosted stories of mine tells me a story of no real change. Non-boosted stories can vary. Recently one of mine has been doing very well and the read ratio kept going up day by day. I also get the odd weird comment, but I either hide it, report it, or ignore it, as I suspect the next culling of bots will deal with it as it often does in my experience.