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Apparently, this is the source for the app. The folder name in the repo contains "sia". I can think of two popular blocking apps, Truecaller and Should I Answer, so my guess is Should I Answer.
https://gitlab.com/xynngh/YetAnotherCallBlocker/-/blob/master/FAQ.md#whats-the-source-of-that-third-party-crowdsourced-phone-number-database
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.