I agree, people rarely use discord to join crypto community, I also only use discord whenever it is required to join in certain bounties or if ever there are generous give-aways, or important updates that is only announced in discord. If your links are intended for referrals this should be removed since it is not allowed in this forum. You should've also posted some information that you have posted for readers to have an idea.
Simply he wants to promote his group and promise to do many giveaway, but since there is no specific purpose, i think that group will be a place to promote his project (a project that paid him to promote)
I hope
crashdice would also make a telegram group not just Discord,
People use telegram rather than Discord so it is easier to attract more people in telegram,
But I really like their site and it is great and new CrashGame since it has a weekly giveaways for their top 5 gambler.
I hope so, I'm beta tester of crashdice but not joined its discord community group because it's too many this kind of platform for me to use