Patreon is owned by the VCs and will eventually make changes that negatively impact creators.
That said, if you maintain an OSS tool, please do set up an easy way to donate. When it's easy to donate a dollar or two, I do (well...occasionally). I've found very few developers have Patreon's setup. Some will have a PayPal link, which is especially nice for random online tools that I use once or twice. Most don't provide an easy opportunity to contribute financially. Though I guess I should keep more of an eye out for them.
(While Googling for more info, I did come across https://github.com/feross/thanks -- so that's neat.)
You can't just provide software that 1000s of people use. You now have to be creating some story around it on Patreon or whatever, have a way to get people to patreon or your website in the first place, which will only take away time from your side project.
Numbers just don't add up. You can perhaps expect $50/month with those number of users if you really, really tried and spent countless hours on propagation. That's like 1-2 hours of work in a real job.
For a cli tool distributed in major linux distros you don't even have a way to get people to your website, because mostly just packagers will go there and some people with exotic preferences who build from source, which is a tiny minority.
These websites solve none of this.