I just betting a few cent by the way, not really making any deposit at all.
Yeah maybe that's one of the reasons because they prioritize active users based on the instructions in the last email as posted by @Toro iskandar
Just wanted to let you and other users know, when they remind me to be active what I do is withdraw all the bonuses I get from weekly/monthly then redeposit so my account is active in deposit then play some inhouse games. I know some people are lazy to do it especially those who don't care about small bonuses.
I have also received the July subscription bonus. The bonus amount is same as yours, it's $15 and I have already lost it

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I got info that other users not participate in the July subscription actually got a bonus today with a different title ''Esports Bonus'' but of course only for lucky users
Indeed, this week there is a major tournament in Esports so I think the bonus is related to the celebration.