Buggy how? What specifically is an issue? Have you ever gotten to a stable and working point? If so, what changed?
I personally only use Linux in servers. It may take a while to configure initially, but then I don’t touch it in any meaningful way for years.
I think you’re massively downplaying how much of a hit this will be.
Let’s say you make $100k/year. Think about the lifestyle it allows. You’ve just been informed that it’s now going part time, and you’ll only be making $15k/year. How far does that get you?
Now, you’re expecting someone else to pay for that advertising spot, so it won’t be that bad. But who is even eligible? Microsoft’s Bing is the obvious answer, and probably DDG. The rest of the default search engines aren’t even general web searches.
Do you really think that either of them are going to pay any significant amount to be the default? Especially when most people are going to change it back to Google anyway, since these are automatically people willing to change to a different browser?
Sure, they might be willing to pay something. But it won’t be anything close to what they had before.
Thinkpads are extremely well documented. For how to repair/replace parts, you need the HMM. Just Google for “Thinkpad t14 Gen 1 HMM” and you should find the official PDF on their site. That will tell you, step by step, how to replace the keyboard.
As for the part itself, you can again check Lenovo’s site for all compatible parts (FRUs) and find the item number and details. While I wouldn’t recommend buying directly from them due to cost, this should give you the information needed to find it elsewhere. eBay has tons of Thinkpads being sold for parts, and many of these will be parted out. You should have no issues finding what you’re looking for.