Who keeps free anonimous proxies?

Hello.
I'm wondering.... who is interested to provide free anonymous proxies? I mean who keep the servers (hardware/software).

Question 2: Is it possible to find botnet proxies if i search free proxyes using an ip range tester like Http Proxy Scanner? I ask because I don't want to use botnet, so just to be sure I'm not outside the law...

Question 3: Can I test a list of proxies to see if they are botnet or not?

Thanks!

1) If you're talking about free anon proxies on proxy lists, they're a mix of: misconfigured routers and corporate appliances, deliberately open proxies, botnets.

2) Yes, you will probably find botnet proxies if you are scanning.

3) No, there's not really any way you can tell if the proxies are from a botnet or not. Possibly you could look them up on one of the spam blocklists and use that as a guide. Possibly you could use the OS fingerprinting in nmap or other network mapping tools; if the host is running Windows, it's liable to be a compromised PC. But that's a lot of effort for not much return.

My advice: don't worry about it. Getting caught in a honeypot is way more of a problem than accidentally using a botnet proxy.

I like the idea of checking if host is on windows
I'll try in future a scan like this, don't know yet how.

I'm not really concerned about proxies for short time. But in time I think it's a good idea to be more careful when scraping serps for example.
I'll use now proxifier for tunnelling to a good proxy. Then a list of "public" proxies for scraping (directly in SB for example).
I hope to achieve double protection like this:
computer > proxifier proxy > public proxy > internet
Can someone confirm if using proxifier will do this?

And what ways are to use more proxies for better protection? like
computer > proxy1 > proxy2 > proxy3 > ... proxy8 > internet