IF a single IP address and device sends out a suspiciously big amount of requests in a short period of time then it is most likely a bot. When you change the proxy server
that your web scraper uses you change the IP address under which the scraper visits the site, thus the website thinks that it is being accessed from different locations. Web scrapers also use HTTP header rotation, HTTP headers contain basic information about your device whenever you send a request to the website, thus changing both of these identifiers makes it look like many different devices from different locations are accessing the site and thus it is very hard to block.
If you need the best proxy tool to capture customer comments, I recommend roxlabs,Here are several reasons for recommending Roxlabs:

1. Have a large IP proxy pool. Worldwide, it has 90 million residential IP and network coverage in more than 200 countries.
2. Have the fastest network connection speed. The unique feature of Roxlabs architecture is that it can provide single hop connection for residential proxies. Traffic is not routed through end-user devices, so there is no bottleneck.
3. Provide free trial. After a new user is registered, 500MB traffic is automatically received, which can be directly extracted and used without limiting the amount of IP.
4. Relatively favorable price. Only $3 / GB can start the residential proxies program, provide the best price in the market, and the quality is like the best-selling product, or even better.