The way around getting “locked out” of your files is to save as an editable PDF with layers intact. It’ll still open in .ai or Photoshop but it’ll open on any device that can handle a PDF as well. RGB vs. CMYK can pose a challenge, depending.
There is no getting “locked out” of your files. The program and all your files are on your own computer, not in the cloud. The only thing on the cloud is upgrades and support, which will continue as long as you pay.
I’m not sure if they can lock out access to the programs, but they cannot tp your files.