Bitvest and 777coin signature campaign is one of the oldest campaigns. I have been a part of this campaign back in my early forum days. They used to pay this little amount at that time too. Well, $40 max pay for Legendary seems low though. If I'm correct, I used to get around $35 for 60 posts per week back in 2019/20.
Because they deducted the payrate, it was 6,500 Satoshi + 500 Satoshi (bonus) for Hero tier A, so the maximum is 0.00397500 BTC/$110. If they use the old payrate, many good posters will try to join since it's still worth and long term.
But with the current payrate, I think they either only get spammer or AI poster.