Only lets you add 5 words to the blocklist before asking for a paid subscription
Though I understand and respect that this is the only way for small app developers to make money, I just wished the app would let me add more keywords than that for free as there are very few iOS-friendly apps/extensions out there that are made for this specific purpose (if I knew how to code I would definitely make a keyword blocker app though I am hopeless with advanced tech things like that)