It doesn't look like you have a problem with people hosting their own instance of dad bot (which is great considering the current situation) but since there isn't an open source license, modifying a private instance is not allowed I think (since the default is all rights reserved).
If this is what you want, it's probably a good idea to add a license file that just says "All rights reserved" or something.
If you want modified private instances to be open-source I suggest choosing AGPL, otherwise ISC will probably suffice (as it is used in cluster client). If you really don't care what people do with it, you could choose Unlicense. But please do inform yourself about all options here: https://choosealicense.com/
It doesn't look like you have a problem with people hosting their own instance of dad bot (which is great considering the current situation) but since there isn't an open source license, modifying a private instance is not allowed I think (since the default is all rights reserved).
If this is what you want, it's probably a good idea to add a license file that just says "All rights reserved" or something.
If you want modified private instances to be open-source I suggest choosing AGPL, otherwise ISC will probably suffice (as it is used in cluster client). If you really don't care what people do with it, you could choose Unlicense. But please do inform yourself about all options here: https://choosealicense.com/