Earnbet seems to have a good run as far as checking their ANN thread. However, there was no activity on that thread right now.
But their Telegram group is very active as I checked it. They have a large community there too.
Maybe they think it's not necessary for them to have an active thread although it's advisable and recommended.
I think EarnBet is having a kind of referral campaign running at the moment ..
https://earnbet.io/affiliate - link not working so I can't checked it
https://blog.earnbet.io/en/promotions/ - no on-going promotions related to referral
I think the marketing is happening on telegram which I think they create a hyping campaign which make people feel excited upon playing nor to have a discussion with them, but I wonder why they leave their ANN here unattended where they can choose to make it active and run some several contest to get more players unto their site.