There are a lot of public bitcoin mining companies:

Ranking Public Bitcoin Miners - February 2023 | Blockware Solutions [PDF] #130875 https://static1.squarespace.com/static/5de588aa3e9c044c1ad8cb59/t/63dd39878a139c42a058d326/1675442568403/Ranking+Public+Bitcoin+Miners+Feb+2023.pdf

But there are very few (if any) other public companies that are bitcoin-only.

You already mentioned Microstrategy, but their main line of business is not bitcoin-related, just that their only digital asset on their balance sheet is bitcoin. Same for Block (Square / Cash App) -- they feature bitcoin buy/sell in their Cash App wallet, but their main line of business is not bitcoin-related. Coinbase is highly related to shitcoins, with a smaller bitcoin portion. Swan is reportedly preparing to do an IPO, and they are bitcoin-only.

There are other public stocks ... with bitcoin involvement as well, like Robinhood, PayPal, Silvergate (bank), and more.

7 Best Cryptocurrency Stocks Of 2023 https://www.forbes.com/advisor/investing/cryptocurrency/best-cryptocurrency-stocks

And then there are public companies and funds with bitcoin on their balance sheet.

Bitcoin Treasuries updated with charts and time series data #76034 https://bitcointreasuries.net

There are many bitcoin-related and bitcoin-only startups and other private companies that have investors, and there are venture capital funds and angel investors that invest exclusively in bitcoin-only companies and others that invest in bitcoin-related companies. And along that note, there are many unregistered securities (ahem, ... shitcoin tokens) related to crypto-related (and bitcoin-related) organizations, and even some for bitcoin-only organizations. And even that varies. Blockstream sells a token for their Bitcoin mining note ($BMN) but only to accredited investors.

I know that doesn't answer your question of "Would you invest in stocks of bitcoin related companys", but hopefully this reply has provided a bit more background on the landscape for investing in bitcoin-related organizations.