Currently, the only other lifetime open-source extension available that offers Ad Blocking with customizable filter lists is Ad Scrubber, an app from roughly seven years ago that doesn't properly, you know, block ads, since the Safari API's changed so much. Everything else (AdGuard, specifically, though there are some other shell apps) requires a monthly subscription. This one is lifetime. I don't feel like I need to explain why that's a benefit.
On another note, I feel like someone needs to come around and make a little ad blocker that just uses EasyList and StevenBlack by default, or allows you to implement a hosts blocklist, that's FOSS. This is the closest thing to it that's functional right now.
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