It's a tricky balance. Once the signal to noise gets bad enough, even if the cost of ignoring individual events is low enough, the cumulative cost of ignoring so much overwhelms any positive value. Twitter now seems bad enough that it's like living in an interesting area with horrible noise pollution and high crime rates. Over time it just sucks the life out of you. It might make sense to try and change things if it were a public good, but it's not, and Elon seems to want it this way, so it won't improve, so for many people it makes more sense to leave.