[mindslight]

While we're at it, potential customers shouldn't need to identify pictures of traffic lights and buses to shop your store. If you're a web store, then you're in the business of selling things and advertising that you're selling them far and wide. The only place you might need a CAPTCHA is the account login page, and only then after there are multiple failed attempts from the same IP address. Other than that, get the fuck out of your customers' way.

[Karunamon]

Depends on if you have a bot/scraping problem or not. Though admittedly sitting behind something like Cloudflare and leveraging their reputation system rather than blithely embedding recaptcha into your page might be the way to go, but then you're married to Cloudflare. Pick your poison.

[mindslight]

Apart from the caveat I gave regarding logins, there is simply no such thing as a bot or scraping "problem" for a web store. Your goal is to advertise what you are selling far and wide - bots are your friends. If you have problems with site load, the first thing to do is make your site more efficient. If you're a small operation and that still isn't enough, add generic server side throttling.