Is the tier updated when a sponsor reaches the time corresponding to the prorated amount they paid?

[pawamoy]

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1. Someone starts a sponsorship of $50/month.
2. They configured annual billing, so they pay a prorated amount of $360 (just an example, that depends on the date).
3. They immediately schedule an update to their sponsorship, to select a new tier at $15/month.

Their $360 gives them 7.2 months of $50/month benefits. After that they should only enjoy $15/month benefits. But I believe GitHub will now list them as a $50/month sponsor for a whole year? Or will it list them as $50/month sponsors according to the prorated amount they paid, meaning 7.2 months, then list them as a $15/month sponsor?

I'm asking because if the former, then people can game the system to pay a fraction of the price to get higher tier benefits, and as a maintainer it seems quite hard to automatically check this. I can fetch sponsors activity, but it doesn't look like the API lets me fetch the prorated payments (for this I have to export data manually from the dashboard).

[pawamoy]

will change at the start of user's next billing cycle

Hmmm so I guess it won't be a full year. Seems good.