but it is under the: GNU Affero General Public License v3.0 Permissions of this strongest copyleft license are conditioned on making available complete source code of licensed works and modifications, which include larger works using a licensed work, under the same license. Copyright and license notices must be preserved. Contributors provide an express grant of patent rights. When a modified version is used to provide a service over a network, the complete source code of the modified version must be made available.

So he cant revoke anyone of using the software he contributes

i think most apps have a word filter that you could use.

if you generally want the content but not the spam way you are experiencing you could have another app without filters.

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