Devs are the 'product' on LinkedIn, I think this could be possible. It could make sense de-rank "inactive" profiles in recruiter searchers to better connect recruiters to candidates that will engage.
I could also see LinkedIn tweaking the algorithm to respond to the changing labor market. When the labor market is tight, get the recruiters any dev profile that meets their criteria, even if it's unlikely to engage. When the power shifts to the employer, it could make sense to de-rank inactive profiles and focus on getting recruiters in-touch with candidates that will engage.
As a side note, I know that LinkedIn gives me a lot more engagement when I engage with other people's content, and it gives me less engagement when I don't engage with my feed.
If you reply to every recruiter who contacts you, even if you mention you're not interested, you will have a higher rate of recruiters contacting you.