A very IMPORTANT thing to note about @Vivaldi's instance:
This is the most blatantly commercial instance I've come across. Not a complaint -- it's just reality.
Once again, *everyone* should know that not every instance is run by volunteers. Some of them, like social.vivaldi.net, are run with a clear for-profit motive in mind.
Not all instances need your donations.
Vivaldi Social certainly doesn't.