I agree with you in terms of Bitcoin and major alts (esp ETH and Sol) but what about the other alts and shitcoins? I can't see institutions buying those.
Which institutions are you referring to? Except for ETFs that have to publish daily buy and sell data, other institutions, whales, sharks, and market makers will not notify you every time they buy. If you want to know what coins they are buying, you need to be knowledgeable, spend time researching, and use paid tools to track those information.
Take a simple example like Grayscale investment fund, since Bitcoin ETF and ETH ETF were approved, they continuously sell Bitcoin and ETH every day. But on their website or social media platforms, they openly announce when they invest in other altcoins projects. Recently, they announced that they invested in SUI and TAO and before that other projects like NEAR, AVAX…they have been investing in many altcoin projects. Many funds and organizations are quietly investing in various altcoin projects.
https://x.com/Grayscale/status/1821170731478356476