Since you brought up m3aawg I will note that it does have a best current practice for block lists which specifically declares that asking for payment for removal is not acceptable
RIPE should consider only listing block lists that are managed according to accepted best practices
There are also blocklists that expect payment for delisting. M3AAWG strongly discourages the practice of blocklist operators charging delisting fees in any form; we acknowledge that under some exigent situations, listed entities may choose to
pay such fees. For example, paying a delisting fee may be a viable option for senders who are able to quickly identify the underlying problem, solve it, and have no issue paying such fees. However, failure to identify and solve the problem sets the sender
up for future listings and, thus, future delisting fees. Furthermore, a payment does not preclude future listings for repeated problems or different issues.