So many people seem to recommend this app, but its obviously not open source and requires an email to signup, which seems unnecessary. Are there any good open source alternatives that are a one-stop-shop of sorts rather than a bunch of mottled scripts?
I don’t know of FOSS “one-stop-shops” but these services should have APIs you can use and write scripts to mass-delete. It wouldn’t be particularly hard or time-consuming, and you can also publish your scripts so other people can use them instead of writing your own.