Wikipedia is set up as a nonprofit. They have annual fundraising drives asking their users for money. They also have an endowment and receive grants.
when you donate money, you're not funding wikipedia's operating costs. wikipedia itself is self sufficient. what you're funding instead is the wikimedia foundation- which is set up to not receive grants but to give them.
the drives are misleading, to say the least
reddit was always a piece of shit that benefitted from the death of traditional forums and the gradual enclosure of the internet