I would like to use Streamtip to accept Bitcoin donations but I don't want to get a Coinbase account.
Is it possible to just give my own Bitcoin address instead?
That's not possible, sorry.
Is it maybe possible that it gets implemented as a feature?
No. We use Coinbase because they are the man in the middle, not us. We do not wish to be in charge of any money being exchanged.
How would you be responsible in any way if a user is able to directly send Bitcoin from their address to mine?
We have no way to easily track payments through the blockchain without significant effort that way, sorry. Bitcoin is such low usage that it make no sense for us to waste time pursuing it any further.
That is a shame, thanks for the response anyway.