avast doesn't require a Google or Facebook account.
i see last 20 years that minority starting rule majority of people
That has been so for 1000's of years.
Guess why we have locks on our doors.
And for the captcha, it is not disrespectful in any way.
It helps a lot to keep spammers out.
As for the marking of mails as spam :
In the antispam settings you can specify how spam emails should be marked.
This can then be used to create a new rule in your email client, for example to automatically move the marked emails to another folder.
The antispam filter is effective for messages delivered to email accounts installed on your computer such as Microsoft Outlook, Outlook Express etc but not for web based email accounts such as Yahoo, Gmail etc which have their own antispam options.
It simply means you haven't setup things correctly and/or do not know how things are working.