Protoshares which became PTS where sharedropped on. That was there purpose and when the the share drop happened they were suppose to die.You have to understand, the developers (Dan) did not control PTS, it was a POW coin. After the share drop some ppl decided they wanted to keep it running. How do you stop a decentralize POW coin if people continue to mine it? That's why its confusing because there was no way to shutdown PTS after the drop.

Later on some ppl decided they wanted to upgrade PTS to use DPOS like BTS but they fail to get the support and the zombie PTS kept living.

Brownie PTS is actually Brownie Points. People started abbreviating the Points to PTS which of course has caused more confusion for new people. Brownies are user token on on Bitshares issued by Dan to reward the people who have gone above and beyond helping BTS to work. One of the partners decided that they wanted to drop on these peple because they have shown love for the project and would be the kind of ppl they would want to work on their project. Again brownies were not meant to be sharedropped on, but how do you stop somebody from doing it?