How have they learned from the debacle of RBLs and censoring firewalls? I finally stopped running my own mail servers after 20 years because of the block lists

How have they learned from the debacle of RBLs and censoring firewalls? I finally stopped running my own mail servers after 20 years because of the block lists. The RBL's continued false, silent bans caused too many mail delivery failures. The RBL's don't care about me, so I had to outsource to a mail provider so large the RBL's have to care.[1] On censoring firewalls. There are businesses which cause their competitors to be blocked by http censorship lists. It is unlawful, but the censorship engines accept anonymous input to make their decisions and it isn't hard to hide the tortious interference. Will DNS blocking have a similar effect of squelching the small and the new? Will it be abusable by nefarious people? [1] For many years I didn't see RBLs as a problem, until I no longer controlled a large block of IPs that I had had from the early days of the internet. Now I have servers in mixed blocks. and most useless of all for email and web servers, reused IPs. (Blockers sometimes remember the sins of years ago and reinstate blocks based on a previous owner.)