

This
I’ve been very outspoken about my non-belief in intellectual property; I don’t think reading information or making a copy of it is stealing it. On the flipside, these bots are effectively performing a denial-of-service attack on public infrastructure, wasting computing resources, bandwidth, and time that is finite. The internet is for humans first and bots second; I don’t care about bots so much as long as they are well-behaved, which these are not.
My own instance went under several weeks back, then I installed Anubis and suddenly it’s usable again.
Note that “source available on github” doesn’t necessarily mean it’s free software. You have to look at the license to make sure.
That said I believe Stremio’s repos are licensed freely (the web app looks like it’s GPLv2), but as OP noted their application(s) are proprietary.