Absolutely! Worse, they got hacked last month - staff gave hundreds of hours getting it back on track. I can usually only give $5 - $10 each time I'm asked, but as someone who bought a car by setting aside every $5 note given in change, it adds up! For photographers in particular, Butkus and archive.org deserve our gratitude for preserving all of this knowledge and making it accessible to the world. A dollar or three every now and then to either/both is a very worthy investment.
No affiliation, merely a deep appreciation for the preservation and sharing of knowledge.
Did I mention that Photrio has a donation facility if you're unable to commit to a subscription for whatever reason?