Forum is getting financial from banner ads and donations. Considering the current value of Bitcoin and the amount of BTC that still on the forum treasury. It can support the forum needs for a very long time considering the value of Bitcoin will not go down to 4 digit. Removing signature campaign will minimize spam, low quality post, jeets poster and all sort of nonsense post.
Rather removing the signature will increase the number of low-quality posts and spam because no one would want to spend time writing quality posts in order to be eligible for weekly payout, they would see no point in writing or putting effort into whatever they are posting because they are not getting paid for it, nearly 96% of shit posters and spammers on the forum are users without signatures. They simply leave a one-liner sentence and leave.
Ads are the forum's primary source of revenue, and it needs to maintain a high level of traffic to stay ahead of the competition, which requires more activities on the forum. Removing the signature and avatar will have a negative impact on the forum.