Why can't search engines include content in mobile app platform? What is the technical principle?

search engines, no matter google or bing, cannot search the content of mobile app platforms such as Wechat official account. It is said that the mobile platform is not open to search engine crawlers, so is this rejection based on the server of the mobile platform or some kind of protocol? Does it have anything to do with SEO? Do mobile servers also use robots.txt to refuse crawling? Won"t this refusal be forced to break through?

Internet Baidu google seo search-engine
Jun.28,2022

there is no entrance, of course, you can't climb it. (most of them can only be accessed through Wechat. Of course, you can't SEO)

search engines grab web pages, and native app is not web pages.

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b321f5-2bdd0.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b321f5-2bdd0.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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