Nah, I get spam for my personal website where I host projects etc and also use as a convenience domain... It's pretty clear that I don't actively want to be indexed (if they wanna do it then sure but I'm not sure what they're searching for) and yet they're still talking about how they can get me more sales for my... Open source tokeniser and instruction set I guess?
Do you have your email published on the website somewhere? Could just be because it's out in the open where all the bots can scrape it. They don't know what's on the website; only that this email is associated with one.
Nah, it's just a very generic address at a custom domain, so I imagine they just have scripts to email {enquiries, admin, info, help, etc.}@abc.xyz or something