What do bot-prevention mechanisms like that mean for crawlers, such as Google bot, or apps such as Discord trying to get titles of pages linked in chats? Are we

What do bot-prevention mechanisms like that mean for crawlers, such as Google bot, or apps such as Discord trying to get titles of pages linked in chats? Are websites enabling such functionality less searchable? In my experience Vultr website keeps nagging me to solve captchas on Linux (but not Mac or Windows), but they still seem to show up in search results.