Does anyone know why it's never possible to just transfer money, but they ask for patreon or paypal? I live in the EU and as far as I know its super cheap to send money into a bank account. At least cheaper than what I suppose is patreon's cut.
Despite getting free transfers (UK), I prefer middlemen.
I've had one transfer via Revolut, it was significantly more effort than I'd expected, but I'd do it again if explicitly asked for.
General security advice is to not share your bank details. I'd rather take the hit from PayPal fees or someone not donating rather than worrying about fraud. [0] for example.
Patreon (etc..) is recurring revenue, which builds confidence that what you're doing is sustainable long-term. When an OSS project opens for donations, it typically has an established userbase. The first "ask" will bring a comparatively large amount of money compared to the next "ask", and it raises the question of whether one-time donations will dwindle to zero. Recurring revenue hedges against that (and also allows more community building).