Pleroma will soon begin blocking Tootdon from authenticating to the instance, using a configurable application blocklist. https://git.pleroma.social/pleroma/pleroma/issues/944 is the tracking bug for this, if you're interested.
one may wonder why Pleroma is planning to block Tootdon, the answer is that Tootdon sends a copy of every post it sees to Tootdon's corporate servers.