You mean receiving small donations or giving out small donations?
I do both since I got an app on the App Store, I set it up so that people can give me small tips. It makes around 150€ / year and I definitely appreciate the support. The biggest issue with this is that every now and then people send a tip and expect me to implement whatever feature it is that they want. This will of course not happen since 10€ don't make up for a day of dev time.
Giving out small donations is also something I do on a regular basis, like supporting creators on Patreon and Github. It really doesn't impact me financially and if more people would do it, we could definitely have a more diverse and interesting app / creator culture.