Subscription Tiers, Not Hidden Fees
Bajie's plans are intentionally described here in qualitative terms — what each tier includes in relative terms — rather than fixed dollar amounts, since pricing and limited-time offers are adjusted on the provider's own live pages more often than an informational mirror can track accurately.
In practice, tiers differ mainly along two lines: how much monthly data is included, and how much priority a subscription gets when node capacity is under load. Client compatibility (Clash Meta/Verge, Shadowrocket, sing-box, v2rayNG) is the same across every tier.
If you're deciding between tiers, a reasonable approach is to start with whichever matches your current usage pattern and adjust later — subscription-based services like this are typically straightforward to upgrade once you know how much data you actually use in a normal month.