Why does spam start pouring in after optimization?

Question

Search Engine Optimization

Good afternoon!
When optimizing sites, this is not the first time we have encountered such a problem: after optimizing the site and re-indexing, spam begins to arrive on the feedback forms. We did only the internal optimization of the site. With what it can be connected?

Answer 1

So, put a captcha, load the form with Ajax, or hang an additional hidden field, if it is filled, and this is exactly what the robot will do, then do not send the letter.

Answer 2

Most likely, when optimizing sites, the standard names type and name were affixed to the forms

Answer 3

forms must be programmed correctly because