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If you read the big, ~read~ red and nearly glowing banner above it you'd see that:

> Notice: sr.ht is currently in alpha, and the quality of the service may reflect that. As such, payment is currently optional, and only encouraged for users who want to support the ongoing development of the site.

There are no features to distinguish the variations by - they're all donations, effectively.

Though i admit they could improve that UX further still. But, imo - the entire product is not super polished for "mainstream users" (of which i mean nothing against), so polish in this specific area might be cart-before-horse.