DashingAgent is explicitly asking for donations in his signature, while the example you cited merely lists an address. I would not consider the two to be the same.

I think asking for donations in a signature should be acceptable. Asking for a donation in a signature is essentially the same as trying to get people to support your cause in your signature, and I would say the two are very similar.

GOODCASH on the other hand is engaging in asking for donations in his post, and I don't think this should be allowed. The majority of the post is not asking for donations, and I would describe his asking for donations to be a "signature" that is not in the signature area, and this is not allowed. I might argue an exception should be made if a lot of effort or ongoing effort is put into a post or thread, such as the rank up pipeline thread, but that is not the case for GOODCASH's thread.