Earlier quoted context omitted.
Of course you understand it, but do you agree with it? If you seek out bugs in a company's code with the expectation that you'll be rewarded for it, and then the company fails to reward you, I can see that it might be perceived as unfair, especially if the company indicated that such an expectation was reasonable. If you happen across a bug in a company's code, and then publicize it because they aren't going to pay y…
Well given that homakov has found this bug, there are a few possibilities: A. Homakov could do nothing. This leaves Twitter in the same state that it is now, but it if everybody did this, it is likely that nefarious people would find and exploit bugs in Twitter B. Homakov could donate his time, as a skilled and highly-trained professional consultant, to a $32bn publicly-traded company C. Homakov could practice full d…
This is probably the best option, but only if you approach it the same way most contractors do when offering a discount/free service for a client.
When you do free work, don't say it's free -- instead, say that you're offering a 100% discount. Sent your client an invoice for the price you'd regularly charge for such a thing, with the entire price deducted off at the bottom. Include a note saying that this is an offering of goodwill, and that you hope this will help in building a relationship with them in the future.
Leave the client to decide for themselves whether this means that your future vulnerability reports will come without this discount, and see what they say in response.