The site exists due to donations from visitors. Unfortunately, hosting services, protection and domain name cost money. And it would also be very nice to receive a small reward for my work done. And although the site is connected with advertising - this is not the advertising with which you can contain the site, and financial assistance from those who are not indifferent to this site, will not be superfluous.
Not a big clarification: money is needed all the time - which means that it is much more useful to transfer a small amount every month, rather than send a relatively large amount once and not bother. For example: 1$ a month - much better than 10$ a one-time.