Theres no obligation to any team really, if you were a decent driver then you may be required for the odd event, but really if you cant do it or dont want to, theres little anyone can do, trust me ive tried many a time
What teams do want is active members, not people who come and go as they please and might not be seen for weeks on end. We have our fair share of inactive drivers, members who a few years back you'd race with day in day out, all of them go back 4-5 years of LFS and just moved on due to real life commitments, or just move continent (Canada to Dubai). They're like family now, but you'd have to be pretty stupid to ask someone to be part of something if you werent going to see much from them, and they were flakey when it came to LFS. Either that, or you'd have to be one hell of a driver, lets put it that way
Plenty will take you without giving a damn about basic things, those teams start on Monday, close on Tuesday, and on Thursday its back with a new name looking for new drivers for another "new up and coming team"
So will teams make demands of you being available, not likely, but they'll expect to see you frequently, proper (that rules out ~90% of them ) LFS teams want drivers who are commited to racing in LFS, which means no getting bored of LFS and deciding to not tell anyone your latest fad is 'CoD17:Yes were really doing WW2 yet again'.