After further consideration, my idea probably can't work as I described it, due to the risk of bots instantly removing the deposit after posting notes with the special tags and then using those sats for the deposit of another account. If this was automated thousands of times per day, the resulting spam would still be immense and the special tags would be useless.
To combat this, the deposit needs to be locked in place for some amount in time before it can be emptied. Let's say that an account deposit must stay in the account for 7 days before it can be emptied.
If the deposit is, let's say,10,000 sats and we can't access it for 7 days, that would still be long enough to prevent bots from gaming the mechanic.