Nah. Such permanent guarantees are not legally enforceable, if a company really cares about it they’ll structure themselves in such a way as to make it very hard to change by having veto voices in their ownership structure who are for such things and will not allow a change, by writing language that requires some high majority of agreement of these owners that’s hard to come by to change such conditions.
At best you get it in a contract when you use the software but guess what, that contract can and is overwritten as soon as you use a new version of the software with a new contract, feel free to use the old one full of one-click machine compromise vulnerabilities forever if you’d like but in reality you have no choice but to update and accept the new contract.
Nearly all can. All the one’s you’d want anyways work with Jackett. They don’t work via direct plugins but just run Jackett, follow its instructions and connect it to qBittorrent and you’re good to go searching just the same as before. Some annoying ones occasionally require setting up another software like Flaresolver but for the most part the big easy to get into ones that open their doors annually work without that.
While there will likely be some openings throughout the year the fact is most trackers open in the period from Thanksgiving/late November through early January. TL opens then basically every year, a number of more exclusive trackers do open signups then, some for only 24 hours so get an RSS feed of that and remember to sign up IMMEDIATELY as soon as you see a post as the post on reddit may have been made 22 hours into a 24 hour open window, you just don’t know. TL though at least tends to stay open for several days. So if you have no luck before then, wait until that time of the year and then check daily or even twice daily if you can, once before bed, once earlier when you get up or lunch or after work, whatever.