project’s donation funds for personal expenses, like holiday trips

I do have the same overall concerns though and for me enough reason to switch the moment its possible also. But I tend to see the 'the holiday trips' as a symtpom instead of a problem. Later on they explained that some developers received 3 months salary worth of pay over the course of 4 years. Putting a lot more time in it during those four years. If I contributed that much for free I also would spend it on a holiday. But the problem is like you said transparancy:

• No openness of financial transactions which I guess showing salary wouldnt be a problem and if everybody was able to see the salary was reasonable. (and I dont care what people do with it in their private live).
• Maybe they didnt organise it that way (paying oneself for labour and tell everyone) but maybe they used it directly for holidays etc, which is a problem for the business entity they have I guess. Like my boss paying my holiday instead of my salary.
• Reluctant to answer questions in reasonable timeframes (couple of months)